I think it's just a bug in the training missions because they use space to continue. I tried in a non-training mission and it was fine, so I'm going to change fire to y and try the training missions again.
The campaigns can be frustrating in DCS, some more than others. Might want to put labels on. There's a mod that makes them just dots if you feel the full labels are cheating
EDIT: Yep, the training missions worked flawlessly with Fire mapped to Y instead of Space. I've asked the testers to file a bug report, as it's not a very good introduction for new players, when the training missions aren't working properly :
The campaigns can be frustrating in DCS, some more than others. Might want to put labels on. There's a mod that makes them just dots if you feel the full labels are cheating
EDIT: Yep, the training missions worked flawlessly with Fire mapped to Y instead of Space. I've asked the testers to file a bug report, as it's not a very good introduction for new players, when the training missions aren't working properly :