Error in spell check

[CherryTrader]

So my spell check has no visual indicators that it's working. i.e I put a load of rubbish into it and there's no red lines. Online the common solution is to go on languages and uncheck the "do not check spelling ungrammar" function under the proofing language. However whenever I do this (the box is already auto checked in a new document), then look again, its re-checked itself. I'm utterly at a loss here.