The glitches with interdimensional travel

Sci fi and Fantasy Problems frequently befall writers. 

Just look at the message that popped up late last year when - in the course of my research with a lunatic professor - I attempted to travel into the past by inducing a small but safe-to-use quantum singularity in the local café that one can be sucked through.

You'd think it would've worked for the year that was in it, but you can't do a darn thing before those Libyan terrorists arrive. In any present.