Dialcentral seems to be working perfectly for me as well. I _think_ I'm running the version from extras-devel...is there an 'about' screen in dialcentral to see version information? It's 1.0.9-0.
I enabled devel to get the dialcentral update, when dialing a number I get an error: Code: There was a problem with GV: {'data': {'code':20}, 'ok': False} Hope it helps.
There was a problem with GV: {'data': {'code':20}, 'ok': False}