Keep getting Session management error when running imshow in pycharm

[pace]

So I've tried following the advice in other post about this error, but have yet to solve the issue.

When I use cv2.imshow I get the error:
Qt: Session management error: None of the authentication protocols specified are supported

I have tried adding unset SESSION_MANAGER under my import statement, this just threw an error.
I installed Pycharm-community through Flatpak so issuing the following command also does not work.

env -u SESSION_MANAGER pycharm-community

If I run my code in anaconda spyder i don't get the error.
Any advice on how I remove this error would be gratefully appreciated.