Steam - Zero-K rejoin - Cannot rejoin after crash

So. Every time i crash, and, last time just about now - when trying to use Athena to queue more than 15 units as a blueprints for caretakers to fill, it happens.
I crash.
ZK closes down.
I doublecheck if no processes are up.
Not recognizing any process remotely close to ZK.
Still, steam says that ZK is running currently and cannot be opened again.
Any hints how to deal with it short of restarting whole PC?

Edit -
Overlay UIs closed. But they pop up again in around 10 seconds. Literally WTF.
Restart of Steam. Checking... Yup. That works.

Might be worth also closing any GameOverlayUIs that steam has spawned, if you haven't already, though it sounds like you might have.