I don't believe there were any graphics modifications in 3.17...
4 bits is 16 color, yes. 2^4 = 16.
Sounds like graphics card issues, certainly possible something changed in the graphics for 3.17 I suppose...
I'd consider this:
1. Try updating your graphics driver.
2. Try updating DirectX (just in case).
3. See if changing to 'windowed' mode helps (probably won't, but who knows)
4. Try changing the options down, as you were going to; particularly, turn of Anti-Aliasing as that often causes issues.
4 bits is 16 color, yes. 2^4 = 16.

Sounds like graphics card issues, certainly possible something changed in the graphics for 3.17 I suppose...
I'd consider this:
1. Try updating your graphics driver.
2. Try updating DirectX (just in case).
3. See if changing to 'windowed' mode helps (probably won't, but who knows)
4. Try changing the options down, as you were going to; particularly, turn of Anti-Aliasing as that often causes issues.
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