This doesn't exactly qualify as a disaster but here goes:

I made a two tiered mmf covered cake for my boss's bridal shower at work. I have to mention though that I used Crisco to roll it out, so it was somewhat shiny/tacky.

After the shower, I went to remove the top cake from the bottom one (there were a lot of leftovers) and as I was lifting the cake circle, it took all the icing/fondant off from the bottom cake. I've never had this problem before. Was this because of the consistency of the mmf and the crisco? Should I use cornstarch to roll it out?

I seem to have a lot of trouble with the consistency of mmf from one batch to the next. It's never the same! Should I just use satin ice from now on?

This would've been a disaster had I needed to actually use the remainder of the cake. HELP!

I think the Crisco is your problem. It allowed the top tier to adhere to the cake circle, resulting in what happened.

Maybe next time you could put a coating of powdered sugar on it before placing the cake circle in contact with it.

Sorry this happened to you

I"ve also heard of some people using a circle of wax/parchment paper

I use to have that problem also until I started wrapping my boards in press and seal wrap. HTH.

Thanks guys! I appreciate all the advice. I will keep this in mind for next time.

I always sprinkle some powered sugar on the top of the tier before I place the next tier on top of it.