one of my streaming clients facing that problem from a long time ago...
what i suggest to them is to restart the software.
Please tell them to contact our tech support about this problem. We've never received such requests from registered customers - below I'll provide more details for the volume problem in my reply to radiobellissima
so, if i'm here, you have another bug in your software [in my demo version now]
Thank you for this bugreport, if the bug is confirmed, it will be fixed in the next update.