I used this this new card today at black plume mountian und it worked fine except on the last map with the dragon where it just didn't fire even if the dragon was close to them, probably cause he is a large creature? don't know. maybe this is repeatable.
Hmm, this should've been fixed: http://forums.cardhunter.com/threads/release-3-46-0-24-july-2015.7682/ & http://forums.cardhunter.com/threads/dropping-dual-beacon-near-4-size-enemy.7548/ Do you have a screenshot and/or log and more details, what exactly happened.
I've been using (dual) laser beacons fine today on Ogres and such. Is it possible the dragon had Hover on?
I don't remeber. It was just like he had only 2 hp left and i was close to dying so i placed the beacons but they didn't work somehow.