Thanks for your reply!
I've had the wallet since almost the week BTSX came out. This is the first time I've ever been locked out, although it's the first time I've changed my passphrase. It's Windows 4.27.2, and I believe it said it had a corrupted database & would ask if I wanted to rescan the blockchain or just continue, I'd usually just press continue, but im re-scanning right now. Put in passphrase and it seems laggy, its not confirming, nor denying it.
No sleeping cats, I might try copying & pasting. It's strange, as when it randomly logged me in I checked the console & took a photo of the passphrase change...it's definitely correct...