You know the little search function in the top corner of the boards? Well, if it doesn't find what you're looking for, it tells you "no results found" -- but it does so with white text on a white background, making it impossible to read unless you highlight it. Weirder still, if your search term has an odd number of characters, the "no results found" text spins around.
I took a few screenshots of it spinning (highlighted so you can see it)
(This one's older, from a time when the background color was different)
This isn't a particularly big issue, since I know what it says; it's just downright weird.