Well,...
1) thanx for the user who posted the GOG support answer... Didnt test yet (and i may not, see below why), but it seems to be "serious" support answer (as the ones i mostly get from GOG tech support usually), which is quite a refreshing change from the usual tech support crapo i can get from various other companies
2) thanx for letting us know that, even by the tilme of 2018 this bug is still in
3) despite of it may work as said or not, i personally view the "install gog galaxy" workaround just unacceptable ! The whole point of a DRM free game is to be used like that: DRM free... If it is so plagued with major breaking bugs that installing a "so called" optional games management client suddenly and magically solves such bugs and problems, it's fishy to say the least, and it's not an acceptable solution for me !
4) on 2017 i (tried to) play the GOG version of this game, i did it LIVE on stream, and i was so upset and frustrated because this bug was serious gamebreaking one, that prevents the user from playing at all ! I was about to give up, when i remembered that i ALSO had this game DRM-free on a competitor platform (Humble). I uninstalled my GOG version, i installed the Humble one and the "Breach button" bug was just... GONE !
The game was working just fine, no problem like on GOG version
which is sad and frustrating, because it's, overall, a decent tactical game (despite the ugly visuals)... But what the hell were GOG and the devs doing on this one, frankly ? What did happen ? There is a DRM-free build already available on a different store that works just fine... So, why ?
also, sorry for necroing, i was just checking out my list of tactical games (it's my favorite genre) and was considering playing Breach and Clear or Breach and Clear Deadline, but it seems i shall forget it.
I own 3 different DRM free builds of this game:
Android version as a drm-free apk installer; used it on my tablet and on NOX emulator... worked fine
Humble Store/Bundle version, drm-free build too, and worked just fine
GOG version... drm-free but not bug-free at all, and unplayable !
Kudos on this one, some great job was done (sarcasm)