I've seen many on here with the leaky bowls. I actually got a replacement from Krups...WITH THE SAME LEAK! Disappointing, but this machine makes amazing ice cream and sorbet. Love it!
Here's how to fix the bowl. I found that by taking hold of the top collar of the bowl, holding the bottom part stable under my arm, and twisting CLOCKWISE, I was able to get the collar free and off. This revealed the gasket which lays on the collar of the inner bowl (about 3/4" wide). The inner metal bowl sets into the outer plastic bowl which has this freezing gel stuff in it. Anyhow, once I had it apart, I set the bowl on the counter so as not to spill anything (it's not really exposed, but the metal bowl could come out at this point if you tipped it hard). You can see that the bowl and collar are "threaded" sort of...they have 6 sections that are ridged..sort of like the inside of a 2 litre soda cap..not continuous threads. There are lots of narrow gaps on the inside of both the collar and large outer plastic bowl. I noticed that this gel had gotten into them, so I ran the collar under hot water and used a chopstick to get any remaining gel stuff out of the slots (freezing will expand this stuff and likely causes the gasket to unseat in the first place). I wiped everything clean, relaid the gasket over the top of the metal bowl, lined up the spaces and thread sections so I could reassemble them, and pushed it down onto the outer plastic bowl, turning COUNTER CLOCKWISE as it all seated together. Voila! The "threads" caught. I now gripped the bowl under my arm again, and twisted the collar COUNTER CLOCKWISE until it would twist no more. It was tight. I checked the seal, looked good. I froze for 24 hours (rock solid), removed it, and just ran about a quart of water into the bowl and let it sit there. Upon fully thawing, I dumped the water, wiped it completely dry, and shook it around, upside down, etc, for a few minutes. I let it sit again for 24 hours, checked it, and there is ZERO GEL LEAKING!! That is how you fix the bowl. I bet even those with the warped bowls can do this, removing all the leaked gel from the spaces inside, and get it working fine again.
Anyhow, hope this helps!!
Kevin