ZBrushCentral

Zbrush 4r2b Saving problems.

Hey guys I recently upgraded to zbrush 4r2b but since then whenever I work for a period longer than 10 minutes or so without saving the file or my subtool, when I click on save files as or save subtool as there is a popup that says that zbrush is unable to do this operation due to an installation error. Does someone knows how to fix this because it’s very annoying. (When I retopo and I reproject my details ,wich takes more than 10 minutes the project, I’m not able to save my project)

Thanks!