Bug? Jumbling Words & Letters

Hi yesterday none of the tool buttons had any issues, but today instead of the typical writings like "palettes" it's "Rcngwgu" & the letters overlap. Pretty much anywhere I try to click, including saving a diagnostic file has this. It's pretty limiting & I'm nervous my work will get corrupted & lost cause I can't figure out how to save a backup without the writing being right. Anything we can do to fix it? Thanks for reviewing.