The first two questions that come to mind are: Which Red Giant Effects or plug-ins are in the comp that is crashing? Does the crash happen with you try and open AE?
If your AE is up to date, like mine is, and your Red Giant Plug-ins are all up to date (I have most of them), at least on my system, OSX 10.9.4, everything is working fine. Without comp (if a comp is crashing AE), system, and version details no one can guess what's going wrong.