Zbrush Crashes When Dynameshing with Groups Turned On

Ricemachine88

I'm trying to dynamesh while preserving my polygroups Ive created  and Zbrush cant handle it. It just crashes saying abnormal termination.

DavidCruz

So the groups are combined onto one tool?
maybe separate them 1st? (think doing anything will remove the groups, if they are by color choice.) 
That is all i got, i think no matter what you choose the groups may change, i think i ran into this also and just gave into the results and just did them again when i am satisfied, sucks yea.  Unless someone has a trick to offer up, i tried to help. 
Also try this:
https://www.youtube.com/watch?v=E8fKS76zQkY

sprunghunt

I have found in the past that if dynamesh crashes like this it will sometimes fix it if you try dynamesh at a slightly different resolution. Even if it's only slightly eg: 750 instead of 800.