I haven't tried my setup for quite some time.  Before upgrading the RRC Client to the latest version I upgraded the MKII units to the latest version.  
Prior to actually upgrading the Client I checked the MKII units which were working and then checked the Client which works but the volume slider does not adjust the audio level.  I upgraded the Client and still no audio adjustment.  I should have tested the Client before upgrading the MK II units.
I haven't tested transmitting yet as I first need to resolve the receive audio issue.
I saw that the latest version for Client now works with more control programs than HRD and I am hoping I will be able to control my station using Writelog.  Probably won't work but nothing ventured, nothing gained.
The last time I tested my system the audio adjustment had been working properly.  I probably overlooked something.  Any thoughts on a quick solution or do I need to go read the latest version of the user manual.
73 de Walt, W6SA