I'm a daily user of a couple of IntelliJ IDEs. Unusually for Mac apps (probably because they're Java, not real native apps) they make liberal use of option/alt- keyboards shortcuts. I probably use these unthinkingly hundreds of times a day.
Suddenly they're not working. Either they do nothing, or if the cursor is in a text field, they insert a special character (eg. Ø for option-shift-o).
I don't think this has anything to do with the IntelliJ software per se. I mention them for completeness (and because I didn't use the option-key shortcuts in other apps, so can't be sure of the behaviour elsewhere). This is on a 2013 MB Pro, with both the internal and a bluetooth keyboard.
The one wrinkle in setting up my question is that it's possible this started when I installed the 10.11 RC (I had previously been on release Yosemite). I'm not quite sure, unfortunately, as in the heat of getting work done, I ignored the new shortcut behaviour when it first cropped up (so don't quite remember when that was).
So, has 10.11 introduced something that might have caused this different behaviour? Or is there a setting I might have unwittingly changed? I'd be grateful for any suggestions as to why these shortcuts could have changed behaviour overnight, and what I can do to get the old behaviour back.