Looks to me like Procedure Folding (3rd post on this page: Gambas One - Gambas ONE ) has been broken in a recent release.

Can anyone confirm?

 did you try it with a modifier key?
I found it works pressing alt then clicking minus sign

Works for me using the shortcuts listed here.

CTRL + ENTER   Collapse or expand the current procedure.
CTRL + ALT + ENTER   Collapse or expand all the procedures of the current file.

Thanks Bruce & Charlie.

I found it works with <shift> Click, and that <ctrl> Click also toggles +/- but brings up help on the word to the right!

<COLOR color="#BF0000">EDIT: Just noticed that <alt> Click does not work for me Bruce. I wonder if that is a clue?</COLOR>

However, just clicking the + or - has worked for me forever…until very recently. So when time permits, I need to find out if this is an official change (via release notes) or a bug (I'm reluctant to change the detail in my post: Did you know? Procedure Folding until I have an answer to this)