I'm glad to hear that we aren't the only ones who've had trouble with these stupid paper things!!
We made it through our whole December trip without any hassles - of course - we were there on the only 7 days without any rain - the last drops were coming down as we entered the parking garage to pick up our rental - never saw another the rest of the week! The previous two MVMCP's had been rained out!!
We went back in June for a school trip - my 2 DD's and 4 other Jr. High students. They had plastic park hoppers, but we had our same AP's. I usually kept them all in my Passporter Pouch - which has a clear plastic sleeve to protect them. My girls wanted to hold their own passes - so I said okay. DD2 put hers in her pocket of her shorts - zippered in. She ended up in the wet seat on Kali - end result - soggy shredded pass! We did our best to dry it out before going back to the parks that evening - no go - they took the remains, and issued a replacement pass.
As I fueled up the rental car on my way to the airport, my pouch fell straight into a huge puddle (Incredible thunderstorm - I love FL storms!). Even through the plastic window - the passes were soaked. Luckily - they dried pretty flat, as we didn't need to use them again - I'm waiting to see if they go through when we go back in November!!
Here's some info for those among us who like plastic tickets better than paper ones: you can bring them to Guest Relations at any of the parks, and they can give you plastic instead. My parents did this in March without any problems.