Air lock not bubbling

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I brewed an IPA this past weekend and pitched a 1 liter starter. It was in the fridge for a week but that should be fine. The air lock is still not bubbling though. I took a peek inside and it's all frothy and foamy so it's definitely fermenting. I was wondering if anyone has had their airlocks not bubble. This is a first for me in two years of brewing. What do you think?
Thanks in advance.
 
I'd also bet it's a leak somewhere. You could try spraying some star-san (or other no-rinse sanitizer) around the lid or bung or whatever you're using to try to locate the source of the leak. I'd also make sure that the lock isn't clogged or something, which could build up the pressure inside the fermenter...
 
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