I've had this issue for a very long time and it never seems to go away no matter what is tried. I decided to take matters in my own hands and try and solve the issue by just trying different things. It couldn't get any worse right, the plugin is unusable.
I went to the plugins folder for AE CS6 and found ZAXWERKS Proanimator folder. In the support files folder there are several files that I have no idea what they do. I renamed one of the files (Zaxwerks Prefs) to Zaxwerks PrefsOLD and fired up AE again. I created a new project and comp and tried Proanimator. It worked like it should work. Since then, I've been in and out of Proanimator a bunch of times without issue. I haven't wanted to try loading a project that had crashed before, but so far, I have been able to use Proanimator in any way I want. So far NO CRASHES.