I don't know what really trigger these bugs, but sometimes I can't safe the file.

If I want to close the page, then I got the following message:

But the current operation is already finished.

But there is no possibility to save anything!
I must close the program and restart.
I don’t know which changes produce these failures (sometime after a change of simple factor or indices )
But all applications were used with:
- X-Y Plot Region ; version 0.2.7575.39600 - Stable (released at 2020-09-27)
- ZedGraph Region; version 0.1.7604.33474 - Stable (released at 2020-10-26
Also an Example as Attachment