Seems to have just randomly stopped working, it shows zero results for all kanji I try to search. Copy and pasting the same kanji directly into Jisho works no problem.
Tried clearing cache, typing kanji out instead of copy and pasting, closing and re-opening browser, all the usual stuff. Unfortunately to no avail.
Have been using it up to this morning with no problem, so seems to be something that happened recently. Sorry I can’t offer any more info!