GIMP Version: 2.10.32
Operating System: Windows 10 64 Bit
GIMP Experience: Intermediate Level

List any relevant plug-ins or scripts:
Beautify's Borders.. Rip, Simple & Texture

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The theme selector conflicts with Beautify's Borders... Rip, Simple, and Texture. This is what happens when I run the three border options:




I have never received an error like this when using the theme selector, but oddly enough, the borders still work.

There are three questionable statements in one title because:

- it's just a message (about the lack of a required library);

- it is not the Theme Selector that generates the message, but the selected theme (Your theme is probably MurrinaVerdeOlivo?)
Different themes can give other messages:
viewtopic.php?f=9&t=4811&start=220#p274658

- only indirectly related to Beautify (usually the console window is hidden and you can't see what Gimp is asking / complaining about, but JamesH compiled Beautify without the option to hide the console).
You can easily delete this message, but the console window will remain.

That makes sense. The theme I'm using now is MurrinaLoveGray. It just surprised me because those messages hadn't happened when I was using previous versions of gimp. These messages pop up using all of the themes included with the theme selector.