On multiple models if I have support turned on S3D will hang up on "Looking for Overhangs" it will stay there for hours, I have left it to see if it would actually continue. After a while S3D will be at 100% CPU (8 core AMD 4.2ghz if I recall) and will be using multiple gigs (I have 16gigs total). Maybe a memory leak?
This error does not occur with support turned off, it still occurs if I do manual placed support. The files have all been run through Netfabb and are manifold. Sometimes with more basic models I can get it to work If i leave the part on the bed as the way it was when imported. Ive adjusted dense support from 5 layers to 3 still locks up. Ive seen this error under a search, but haven't found an answer on how to fix it.
Also I hope an update is in the works because looking at this page it looks like others are having many more issues than I.