Well, I had never expected, that I ever will miss an error.
The missing animation feature has been good enough for ~4 years and would still be (in my opinion).
Possible known mistakes at user´s end:
Mouse moved to wrong places, klicks in wrong order or too fast.
Browser is a window, not in full-screen-mode.
=> Code greps unusable values for width, height and offset for the graphic´s buffer.
Created files too large, extend ~15mb.
The National Hurricane Preparedness Week: May 5-11, 2024 (US) is nearly over.
I´ll keep the debugger helmet and loupe in range of coverage...