So, I got me a RM1. I think I used it on 1.5.0 firmware (certainly not 1.7.2) and it was working fine. Today I upgraded to the newest 1.7.2 and it started behaving bad - loosing keystrokes, cannot click with mouse, etc.
Why does this happen?
The RM1 is behind a Beryl with NordVPN, before upgrade to 1.7.5 and after.
You mean 1.7.2?
I think others have been reporting similar issues.
yes, 1.7.2, sorry.
hm….
I downgraded to 1.5.0 and had the same issues. I then downgraded to 1.4.2 and the glkvm now mentions the firmware too old. 
But I used glkvm just a few hours ago, is there a way to do so again?
Version below 1.5 ca’t be access from glkvm.com . you can only access it from local network if you don’t setup tailscale