Yes. RC2 for Windows is a debug version too. Dunno if powershell will display those messages though. Please try.I don't have a MAC. Did you build a Windows debug version?
Most likely, yes.I did my own checks. Lemur sends a bundle to QLC+ which includes a time tag. If this is the reason then why does 4.8.5 work correctly?
The OSC plugin has been completely rewritten on QLC+ 4.9.0, so it probably needs futher improvements.
If you have the chance, a Wireshark network capture (.pcap) would help me as well.