Hello everybody!
I've a very big issue with the record button on version 3.10 (it's working fine on 3.6)
You can repeat the issue:
Make a call
Press the record button
stop the recording pressing the record button again
start again the recording
now try to stop the recording: it's impossible until you hungup!!
I think this is a very big bug to resolve as soon as possible!
Actually we are using the version 3.6 but, only on 2 Ghz celerons, we have a very big delay that increases every minute, just as you can read in this topic:
http://nch.invisionzone.com/index.php?showtopic=7177
It seems that no one knows the answer for that issue, so we have tried to upgrade to 3.10 to see if it helps, but the record button problem makes the upgrade impossible 
Thank you very very much!
Davide