After migrating my project to Compiler 6, I noticed that 'Go To Definition' option in right-click menu is grayed out (actually, all neighbouring options are also grayed out - Go To Declaration, Go To Next Reference etc).
Text completion also doesn't work at all, ctrl+space just inserts space. There is an error in the status bar - "Module Error! Text completion deactivated". I'm not sure what to do with that.
All checkboxes about browse information and outputs are checked; there is no space in the 'Misc. controls'; no non-latin symbols in project path (not sure about system PATH though).
Unfortunately, reinstalling also didn't help. I will open a support ticket, thanks!