Ok, first off, I reckon you can get around the white text in white background issue by disabling dark mode. It’s a temporary fix, eventually we’ll need to figure out why those fields don’t honour the system colour scheme and fix that in the code.
Otherwise, they’re a good chance the issue is the presence of a few exceptionally large values in the
SIFT.txt file, causing the min/max automatic ranging to cover unrealistic values, and making it difficult to manipulate back to a reasonable range because everything is then relative to these enormous values. See if you can identify any such large values in the text file (using MATLAB or python, or whatever you have at your disposal). Otherwise, have a quick look at the file contents, see what values it typically contains, then set the min/max values for the colourmap to something sensible for those values by typing the values directly in the text boxes (don’t bother trying with the mouse when the range is so far from what it needs to be…).
Hopefully that’ll get you closer to sorting this out…