SOLVED: NUM LOCK caused this. I never KNOWINGLY use NumLock but I must have hit it.

Ctrl-Alt-Enter does work so I can keep programming but I don't know what is preventing clicking on the +/- to expand/collapse individual subs/functions.

Have a handful of various Gambas projects which were working fine but today while creating a new project, and testing, all of a sudden I could no longer expand/collapse anything in the IDE for any class.

If the code  already had a "-" sign to the left of the code window, clicking it would not collapse it.
If the code  already had a "+" sign to the left of the code window, clicking it would not expand it.

I could struggle through if they were all expanded but I cannot edit anything which is already collapsed.

Gambas version 3.16.3
Rebooted computer.
This issue is on all my projects.

I suggest you remove Gambas from your computer and reinstall. You don't say what Distro you are running, but if it is Ubuntu based then I would use Synaptic, search for 'gambas3' and delete the lot. You can then run the following command that will install the Gambas ppa and the stable version of Gambas (Version 3.17.3 on 2022/10/3).

 Thank you very much for the reply. This was a bone head operator error. Somehow I must have clicked on the Num Lock. I never would have suspected that would cause this issue but once I was attempting to  use the number pad to enter data, the number pad would not work.

Thanks again!