When saving my form all I see is white screen.
I increased memory to 128M, tried to disable all plugins, no php errors when debug is turned on.
Pages work ok.
Tried in Firefox and Chrome.
It was working ok before, theme is custom developed. It still working on staging server, so I think it some sort of server / configuration problem.
I can't loose GF forms data, so didn't uninstall it completely and reinstalled from scratch.