Source block stuck being executed after kernel has been shut down or changed

[mochar]

Specifically I encounter this problem when using a remote kernel like so: :session /jpy:localhost#8888:name.

After shutting down the kernel, or trying to connect to a new one, and sometimes even spuriously while running some code blocks, the package thinks a source block is still in the middle of being executed and I loose the ability to run that block (while still being able to run others).

Closing the file doesn't help, the only thing I can do is restart emacs.

Any tips? Thanks!