Glitch in the system

I was missing a few of the clever system tweaks that I had applied to my earlier iPhones after Jailbreaking them, so when the recent Evasi0n software became available I decided to try it.
Things have been running very well generally - the 5 hasn't become sluggish or glitchy... until today I had this odd keyboard anomaly (oh, and the stock weather app keeps crashing... not a biggy).
I think this 'blackout' was due to a hack I'd installed that altered the keyboard to display lower- case letters when appropriate (not a standard feature). After a restart everything seems fine now.