Testing VST Connect Performer on LAN: I do not recall having this issue prior to upgrading to Windows 10 so it may be a Windows 10 bug:
The STDIO signal inappropriately flows to INSERTS, so if inserts is turned on, and a plugin installed, the signal flows through the plugin to MASTR. For example, if an amp plugin with distortion is installed and turned on, the cue send flows through the plugin, so the signal that ultimately flows to MASTR is distorted. Of course, we want an unaffected cue send. Only instrument channels should flow through Inserts, and mixed with the unaffected cue send, and only if the insert button on an instrument channel is turned on. This is secondary issue: Although instrument channels do flow to inserts, the insert button has no effect. The instrument channel flows to inserts whether the button is turned on or off.
I’m testing VST Connect Performer on three different computers, each running Windows 10, over a local area network (LAN). I’m sending a cue send from a fourth computer, also running Windows 10, using Cubase 8.5 and VST Connect Pro. I have this issue on all three test computers. I’m using a different audio interface on each computer, all Steinberg: UR824 on computer #1, UR44 on computer #2, and UR28M on computer #3. Let me know if you want me to supply additional information that might help you pinpoint the cause.
Let me know if there is a work around or if you can confirm this is a Windows 10 issue that you need to fix with a future release.