As in last version, do you mean modset 1 or v0.63d?
modset 1 I think, your last version.
edit: It only crashes when I try to expand without first previewing. If I preview it, the model preview window opens, gives me an error saying "The Undo operation encountered a context that is different from what was applied in the corresponding Set operation. The possible cause is that a context was Set on the thread and not reverted(undone)." Then the window opens with nothing displayed, though I can still turn on the floor
. Also, just noticed, If I open the pcs/pac and try to preview it, it will give me that error, then I close out the preview window and go to file->close, so it will close out the file without closing BB. Then I re-open that same file, and everything is fine. I can expand/preview and everything.