are other root apps working? or none of them are? i agree,with BC... try uninnstalling tibu and its prokey,then wait until the free app is done downloading before downloading the prokey. its easy to miss the superuser pop up when the prokey downloads if your downloading other apps or doing other things.
if that doesnt work,then you could open your superuser app and make sure titanium is there,and being allowed su permissions.
failing that,id just launch,or boot to recovery and flash the superuser root files like your rom was stock