We definitely know this is a widespread issue! Just to clarify, I am not personally handling this matter -- I'm no programmer. :) But I can assure you guys that Keith is looking into it and trying to figure out what's going on.

Hello, first off this was definitely NOT an intended feature, and we've been investigating and working on this. GA users should not be seeing advertisements (aside from the user-made ads in the forums)

This issue should be completely fixed now. If you're still seeing them, please try completely clearing your browser's cache and cookies.