Colateral save changes reverts to blank browser

I tried this with the free version and thought it would be resolved if I purchased the full version. But it didn't.. When making changes in / editing a post or page and then clicking the save / publish button, I am directed to a blank page and not back to the dashboard. and then when I log out and log back in, I still get a completely blank screen. The only way I can get back into my site to edit it, is to delete the theme via FTP and then re-upload it and make all the changes I made before. Its getting pretty irritating and my client is not very happy either. Hoping I didn't waste my money here..