I'm having a weird issue with the Rich Text Editor (Redactor -> simple.json, only "bold" and "italic") on newly added fields and only ONE (that i know of) older field. Every time i add a "bold" format and then save the entry, it goes back to its previous state and never actually saves it.
If there is a bold word in that block and i try to add / modify other blocks, nothing saves either.
If i don't use "bold" in THAT specific field or newly created ones, it all works perfectly. Even the "italic" option works. If i use "bold" in an other older field, it works perfectly.
It used to work like a charm, no updates has been done since (i did it afterwards to try and solve it: nothing changed).
No trace about that in the craft logs.
Any idea what's the problem? Or how to debug further?
PS: That one is on Craft 2.7.2!