So, just bumped into another weird issue, which flicking off the new elflagfix and showitemcolor fixed, so I'm going to get down to testing the two of them a little later as I can't right now.
When I went to make a check, using the slider bar worked fine with setting custom amounts, however typing in an amount manually would leave the fee as "500", additionally if I then hit enter after typing the amount in, "3650000" in this case, hitting enter would cause it to revert to 10k, showing a 500 gold fee. Didn't try hitting ok, but based on that I assume it would have made a 100k check, as it didnt seem to be registering typed input into the box what so ever.
Possibly related, though I didn't think anything of it until now, I noticed sometimes when I log in my stamina is listed as -2147483647, as in the 32bit digit cap, so that may well be related. I'll get round to testing the two a little bit later and see what happens.
As before, running only Abyss, on the latest version. No data folder to speak of, and poison pack not currently installed.
Edit: Found time to test it sooner than I expected. So when the problem first appeared I tried simply CCing, relogging and then eventually restarting the client and none of this fixed it, had to disable those 2 variable and then it fixed. Interestingly, now that I've reactivated them both, the checking is working again and my stamina is loading in at its correct value. So for now, its a ghost, I'll keep an eye on it and see if it flares up again. Not sure why especially that stamina glitch would persist over a restart and yet fix itself after disabling and reenabling a feature in the mod, as its not like its interfering with character data or anything. Well, I'll let you know if I manage to trigger it again, for now gonna assume it was a one off fluke. I guess this is the modding equivalent of turning it off and one again, atleast for now.