Hi, I've been using adsense for almost a month now. Recently my adsense ads have been turning into these 100 X 100 square ads that don't say "ads by google" on them nor are they the size they originally were (large rectangle, medium rectangle, button etc.). I haven't seen these ads anywhere else so maybe someone here can explain why most of my ad units are turning into these type of ads. I am not a premium member of any kind, i don't get a whole bunch of traffic (100 uniques daily), nor do I earn a lot of money with adsense. I thought this was a normal occurance until a reader actually emailed me and asked how I got those kind of ads. I told him I didn't know because I really didn't know. I can't post any live links yet so I can't show you what these ads look like on this thread, but if you're interested I can PM to you. Thanks!!
Change the AdSense code. Something is conflicting with your AdSense code and making it look like that. Make sure you do something about it because the way they are is against TOS.