I can't speak for anyone here at Bozteck, but I do know that a bug has been found with VNC. The best way to combat against this bug was to either update your client to a new version, or to enable the DSM.
I don't know if this is a bug or not with VENM including it now, but it might be a good idea to change your profile to include it and just redeploy to your old clients to update them.