I finally can reproduce it. Once you know it, it is simple ;-)

(1) Open a sufficiently large text file (more than 25 lines) using Geany.
(2) Open a "DOS" Command Shell and display the file with the command
more FILENAME
(this causes a lock on the file).
(3) Modify the file in Geany and try to save it.

You will get the error message about the file lock, and there is no way to remove the message and continue working with Geany, until the 'more' command is terminated.

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