I tried opening the vents with a file on one of the molds I was having problems with but it didn't help. If all else fails it may be something Charly may want to try. The frustrating thing with my molds is that that bait comes in 3 sizes and I have molds for each size but only have problems with the medium sized bait molds. It could be a gate issue too but I have not messed with that to find out. Sorry for hijacking your thread Chalry.