Go to definition inactive with Arm Compiler 6

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).

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