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groosz wrote: ↑Fri May 26, 2023 5:54 pm During reinstallation, the program does not ask me for registration data, so uninstalling itself probably does not clear all program data

As you said yourself that if uninstalling itself probably does not clear all program data then that can cause problem. Only a proper uninstall and install can solve it. It must be a configuration issue related to the install and the uninstallation.

This is not a problem with incorrect installation or uninstallation because the problem occurred while working with the program. Correct uninstallation is done through the programs icon in the control panel.

I don't know if this has anything to do with it, but I noticed that I don't have a line-awesome.ttf file in the system\iconlibraries\LineAwesome directory

Clearing the registry of all keys with values ​​helped temporarily

WYSIWYG Web Builder
Pablo

after uninstalling the application and reinstalling it. But this is not the solution to the essence of the problem. I hope that in the future we will be able to determine the cause of this error.
Thank you very much for all your help and best regards, Grzegorz