[MacHeadCase]

Ok I think that outside from the font and the highlight colour choices you made, you won't be too hindered by trashing the Finder .plist file so here goes...

Go to Macintosh HD ---> Users ---> Your User Account ---> Library ---> Preferences ---> grab the com.apple.finder.plist and bring it to the trash. Don't empty it right now.

Log out of your account and log back in. Or do a restart and see if that doesn't fix this problem.

Are you up to date in your OS updates, btw?