Very strange... yesterday evening everything was fine with 1.05. Today morning the sim asks for an update. Now I took a landing and the levers moved into reverse but the engines didn't open! I'll try 1.0.8 again, maybe it has to do something with the morning-update.
From several addons I use to make a copy from the content in the communityfolder. So I did with inibuilds A300 1.05. This version I'm using now but I hope, the problem with 1.08 will be fixed soon.
Yes, I use SU15 beta. After switching back to A300 1.0.5 reversers are working again like before. So I'm nor sure if the beta is responsible, otherwise 1.0.5 wouldn't work too IMHO.