I just upgraded ZP to 1.4.4 successfully. I noticed that zpCapcha use weird characters. I didn't change the default option (Allowed characters : abcdefghijkmnpqrstuvwxyz23456789ABCDEFGHJKLMNPQRSTUVWXYZ) but I can see "§ l' ? Ì ..." on generated capchas. And even if the capcha field is successfully filled, the capcha test failed.