UltraVNC Server OCR is not working RDC works fine

[Gert_L]

I am struggling to understand why one of our VNC servers changes the graphical configurations in a manner that causes the tesseract OCR to fail. Using the ENG lang package there.

Does anyone have an idea, what might be cause and potential differents between Remote Desktop Connection (works fine and superbly), uVNC server (fails to detect).

It does not retrieve anything.