Apologies if this has already been answered. I have a few IDE sketches open and some mysteriously go blank. I don't know when this happens.
The really annoying part is I can't close these with the windows X button.
Hi @dougp. I see you are using a significantly outdated version of Arduino IDE. If you don't have a specific reason for using Arduino IDE 2.2.1, please update to the latest version 2.3.2. Hopefully the problem you are experiencing will have been fixed by some of the significant amount of development work that occurred since the time of the 2.2.1 release.
Thanks! I'll try it.
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