I've seen that mentioned in various threads dealing with 4.3 - if you do a search for '4.3 issues' I'm sure you'll come across it.
Something about having to check and then uncheck an option - in Settings -> My device -> Accessibility, scroll to the bottom and find that option.
Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM 10.2 using Tapatalk 4