PyCharm won't save a file

 I have a file that Pycharm doesn't want to save.  I think it get locked by another Pycharm related program, but I don't think its the debugger.

The error message is as follows:

Cannot save C:\Users\<...>\Projects\Estimation Macros\BuildCMR.py.
The file was renamed to BuildCMR.py___jb_old___.
Your changes were written to BuildCMR.py___jb_tmp___.

Its a window box so I restarted it. It fixed it until I ran it main again (Ctrl-F9) which calls this module.

What am I doing wrong??

Thanks in advance for your help

Pat