I've been having this issue as well. It only appears to affect wa that are active upon login (inactive layers, even if they are exactly the same as existing active ones, remain untouched). Duplicating or creating new wa with the same conditions does not work.
If you adjust the size of the font (bigger or smaller, then back to the former size) it forces the text back to a single line. This is only a temporary fix, however. Relogging causes the text to revert back to multiple lines. Essentially, you need to do it every time you log in. It's a bit tedious but I have not found a better solution yet.