I'm running TeXstudio 2.12.16 on windows 7 64 bit.
If, while on the editor I use the "go to PDF" command, nothing happens.
If I right-click on the PDF, there is no option "go to source", and nothing happens if I use the shortcut Ctrl+'.
Those were great features I enjoyed before upgrading to the new version.
Thanks for your help.
Old trick worked: I restored the default settings to fix this problem. I just deleted the settings file (texstudio.ini), while Texstudio is not running.