Happens here as well. Funny thing is when I told the doctor that it made that noise when I pressed by the ear lobe he looked at me like I had three heads. I also told him that when I press there, I can get some of the pressure to clear. Again, three heads. He said that there is nothing in that area and also showed me pictures. Well, there is something happening when I press there because I do get some relief! My guess is it causes the Eustation tube to open or clear.. just a guess.
I started seeing a TMJ doc a few months back but for ear symptoms only. The doc has not been helpful with them. He only wants to talk about pain, which I never had in the first place! The squishy sound comes and goes, but I think it is related to the joint problems. Sorry I do not have anything for it at the moment.