Not fixed in XnView 1.97 beta.
Only the # or $ formated colors work with CheckerColor1 / CheckerColor2 settings, but raw color and R G B formated values still doesn't work. E.g. CheckerColor1=
16711680 or CheckerColor1=
0 0 255 should result blue checker, but instead it's red.
This fix also caused a regression with all other formated # and $ color entries.Example:
TreeBackColor=#0000FF
TreeFontColor=#FFFF00
TreeFontHiColor=#FF0000
These settings should result a folder tree that should look like this:

But in XnView 1.97 beta it looks like this:

Looks like this bug is fixed in the wrong place, as this quote from the changelog hints
"INI Color entry with # or $ are reversed"The problem was not that all # or $ formated colors are reserved, but only CheckerColor1 and CheckerColor2 color entries are reserved. Even the raw non fromated values are reserved with these two settings.