As you can see:
I wonder what happened, nothing was hidden and it fixed itself after re-init zbrush.
Also, what is subdivision history? I can’t find a reference to it in the wiki.
(I imagine it’s something like maya history thing?)
EDIT:
Well, you want to subdivid it again right, but why do you want to do it from the lowest if you already have it subdivided?
If you want to start over and throw away the higher subd history and start new subd, click the delete higher the the “del higher” button below the slider control. That will throw away the history, and the lowest subd technically becomes the highest subd being the only one.
Keep in mind, every time you divide, it keeps kind of a record of the subd levels. Which you only had 2 in your video, and that you were switching back and forth with you clicked the lower resolution button. You can then swap back with the slider or the higher resolution button. Shorts cuts are shift-d to go down, or just “d” to go up. You’ll often switch back forth all the time as you’ll reach 5 different levels by the time you get to the finest detail. And normally you only divide at the highest because you already divided at the other levels.
So you can divide 5 times in a row, and willy nilly go back between them all, and anything you do in one effects them all. Often you go to the lowest to make large moves that translates smoother to the highest resolution. You can delete the lower resolution with the del lower button too. And the wireframe you have on, it will only show a wireframe based on the polgyon resolution you had when you turned it off until you turn it on and off again.
I am having this same problem, it is driving me nuts! :evil: :lol: I have not been able to find a solution. Hope someone knows.:qu:
The only way I think to do any dividing at the lowest subd level while having a higher history is if you had a masked area, which will just divide that area. But if you want to divide the entire model, there’s no point in going to the lowest subd to divide because it’s already divided. that’s what the SDIV 1 and SDIV 2 are on that slider you switch back forth. 1 is the lowest, and the 2 is the one created after clicking divide once in the past. Since 2 is already there, it can’t do it again unless you are at 2 or delete 2.
So the video basically shows you already divided it before, then you went to the lower resolution and tried to divide it again, but it’s basically telling you you already did that once, you can’t do it again because it’s already done. If you wanted it to go even further with a 3rd divid, you need to be at the current highest.
If again you want to start over and divide from the lowest and throw anything you did in higher subd levels away, then click the del higher button. But also keep in mine, the act of dividing has sort of a constraining effect on the original mesh, since the smooth pulls things togethor. This means you’ve already ahd that happen once sicne you’ve divided to 2 already, if you delete the higher history and divide again from the lowest, if will do again. You should just reimport the model, unless the new lowest mesh is what you want.
Hi TimothyB, thanks for your reply, but if you watch the video closely you will see that this is not the problem, the problem is that when we press divide on the on the highest subdivision level we get the message " a mesh with a subdivision history may be partial modified when the Lowest subdivision level is active" Then when we switch to the lowest sub d level we get "a mesh with a subdivision history may be partial modified when the Highest subdivision level is active. So basically for some reason it will not let us divide the mesh. Watch the vid closely and you can see what I mean.
Only guess I have is to make sure there is no mask by clicking clear in the mask panel. Then try again.
The thing is, even if there was a mask, I would still think in the video that it would allow you to divide the area not masked, unless everythign is masked.
Well, turns out, it’s both, it’s masking and not masking.
The first vid, I was just starting with the mesh and subdivide it and brushing a bit and I’m sure I didn’t use any masking, but, this problem is caused by masking as demonstrated in the video below.
My guess is that the first vid was caused by something within the zb engine. I found that sometimes, with your model painted with material, if you go up and down the subdiv, some vertices/face would lose the material info. It’s possible that this happened with masking too.
Thank you for everyone’s reply.
But one question remains, the error returned a wrong error code, it seems.
What the heck is subdivision history?
Hey feureau andTimothyB, good job I will have t try that. 
I believe Subdivision history simply means that your model has more than one subdivision level.
That is an interesting theory on faces loosing material info, I have had that problem too.
Yeah, it’s quite annoying, I think I saw someone complaining about the textures becoming noisy too, but haven’t (yet?) to enconter such texturing issue. Just the mat and probably this masking. I know there was a masking issue on the other z3, I think.
Hi!
This has just happened to me for the first time as well and I’m completely stuck. This is all I did…
-Imported my model
-Subdivided it once and did some Zbrush work (Subd level 2)
-Took it back down to Subd level 1 and saved my tool to work on again at a later date.
-The next day, loaded up my tool again, drew it on the canvas and went back up to Subd 2 where I left it.
-Hit Divide to go up to Subd level 3 for further work, and got the warning!
I’ve not used any masking and have no texture on it. But it means I can’t continue working on my model because I can’t go any higher! And I don’t want to delete the lower subdivisions because I want to export level one back into my 3d programme.
Really frustrating and I don’t have the heart to start again, plus I don’t want it to happen again!
Any help welcome!
Sorry, sorry, ignore that!!
I just hit Clear mask and it works fine again! Must’ve Masked by accident!
Phew!
Worked for me. Thx a bunch.
Hi, I was having similar problem. I solved it by going into each sub level and hit the clear mask button. So if you are at sub level 4 and can’t sub d to level 5, go back to sub 1,2,3, and 4 and press the clear mask button.
Note: I encounter this problem when I hidden certain part of the mesh in sub level 1 and when I returned to sub level 4 and can’t sub d to level 5
Hope this help some of you.
I’m almost too embarassed to admit that I oscillated between my highest and lowest subdivisions like five times before it dawned on me that something was wrong. This reminds me of one of those ‘how to keep an idiot busy’ things. 
Thank you for this thread! especially the part where its revealed there can be masking on different subdivisions!
Please turn this card over and follow the instructions on the opposite side.
Please turn this card over and follow the instructions on the opposite side.
The cue was in the error.
At lowest level, the errors says “fully divided when…”
At highest level, the error says “partially divided when…”
So basically, you’ve been getting hung up on the subdivision history part of the message and missing the key word that’s changing.
At the lowest level of the mesh, there’s no masking or no polygons are hidden. At the highest level of the mesh, a very few polygons are somehow masked or hidden. Because it’s so few of them, that’s not translating down to the lowest level and you’re getting stuck in a seeming loop.
At the highest level, simply clear the mask and make sure no polys are hidden. You should then be able to divide.
that’s a cool method…Thanks a lot everyone…