This month was my first cycle with it, and the first couple days weren't a problem and then I started leaking a lot. I am almost 100% sure the cup is popping open all the way (I felt clear up almost to the top all the way around and it was open. I rotated it, have tried it higher and lower, and made sure that none of the holes were blocked. No luck. It was bad enough that I switched back to my Diva cup (putting it in in the exact same way) and haven't had the tiniest leak since. Interestingly enough, this time I can't feel the Diva cup at all! Not sure if that has anything to do with the problem, but it is the first time in 4 months that it fits comfortably.
What could be the problem with the Lady cup? I really wanted to love it, but won't wear it if it leaks this badly.