ZBrush unsculptable edge along polygroup seam
So I'm trying to fix this problem.. I was sculpting on this model earlier, I had laid out polygroups in order to make it easy to hide/unhide parts of the model. I noticed after unhiding the whole model and trying to sculpt across it... there is now an unsculptable "edge" in my model right where the polygroup seam is, this edge never changes no matter how much I sculpt on it or move it.
It's ONLY this one polygroup, I've tried autogrouping all of the polygoups in hopes of fixing it with no success.
Can anybody tell me wtf to do?
If it makes any difference this was originally a ZBrush 4 model (which is where the polygroups were applied) and this happened after sculpting the file for the first time in ZBrush 4r2.
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Ended up autogrouping it at different sub-div levels and saving them out... eventually it went away. Not entirely sure which part fixed it.