Thanks for reply David!

This is the only one version I had installed and PD quits with some patches but all of them were made on same version of PD. And yes PD quit completely so I have to re-open the application to work.

I'm using Pd 0.49.1 Vanilla on Macbook Air running macOS Sierra 10.12.3 and it happens quite often that Pd quits when I try to save patches or open. I tried to reinstalling Pd several times but I really don't know where might be a problem. Anybody also experienced that? Any help? Please

Thanks so much for help!