My bad I was trying to edit the linked block, your bad that there is no escape from this situation except hard crash.
You may want to try running the _Unlock command
It won’t help. It is stuck at the command
but I found the escape through the Win toolbar panel. Not sure if this qualifies a ‘solution’ 
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Hi Piotr -
What happened when you closed that other instance?
-wim
There was no other instance per se. It had been exploded before. I needed to load it again as a shape reference.
I’m not asking about a block instance. When you block edit a linked block, a new Rhino instance will open. As far as I know, you can’t explode a Rhino instance?
I guess I need steps to reproduce the reported issue.
-wim
I was able to reproduce it.
I have inserted linked block via Insert command, then I got this message.
\
After clicking OK, I got his
I exit the second instance of Rhino,. That message was visible for couple of seconds the was gone.
I guess, it was my fault not being patient enough, or maybe this time everything is working fine.
PS I have never used linked blocks, that behaviour (opening second instance of Rhino) was new to me, and i probably skipped first message.