A UI mod shouldn't be able to kick you to character select. If it's bugged that badly it'll crash the game shortly after zoning in for the first time (if you even get that far.) With that said, I don't know of any mods that have been released that are that badly bugged, and as far as I know of things were still a bit iffy on some servers in some zones last night due to yesterday's patch. I'd recommend trying again after today's downtime and see if you still encounter the same problem.
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