Hi @ripolas and thanks for the extra information.
You issue sounds similar but I’m unable to reproduce the exact behavior you are describing. On my Windows 10 machine, the issue reported on GitHub occurs when first opening Processing and then when Switching to a specific mode for the first time. However opening a sketch file doesn’t cause the issue.
Is it possible you are opening a file that triggers a mode switch? Like if you’re in Java mode and open a file written for Python mode? And does the issue continue to happen every time you open a different file or only the first time?