I'd say that, first things first, swap out (e.g. rename) the ones you have now and copy in the plain ones from another archive copy of the original distributed init files. See what happens then.
If you've extensively manually edited the now swapped-out files, try your edits (you can open open the renamed ones to compare identify the changes you still need to make) one at a time to see what's causing the problem. (Perhaps first do en-mass those changes, e.g. seasonal auto-saving, that shouldn't affect anything, but be prepared to back-track if you've been too generous.)
If the edits to the init files were done by a modpack (something I've no experience with), or that "get you going with all the choice stuff" bluffers pack, whatever that's called, you first have to find the init files, but the process is the same and you can see what it is you've had the pack do for you and may find something else you want to change.
Anyway, this way you'll still have your additional/custom/modded tilesets (but by default it'll ignore them) and raws (which shouldn't have anything to do with this affect), so there'll be no difficult re-installation of all your features, just re-activation of all the visual niceties, at least until you find the one setting (or called file) that has obviously made it go all wrong.
(Does that make sense?)
Of course, someone could have the "just change this line" answer, but what I've said should work until you get a sufficiently accurate response at least.