Not sure on the whole avatar thing, and what glitches keep messing them up. I see avatars come and go all the time on this forum, with large numbers of the generic "Tin-Tin" profile, including my own.
Every avatar pic I have tried to attach only lasts a couple of days at most, then returns to generic. I have shrunk stuff to 100 x 100 pixels, used random photos, personal and non-personal photos, but nothing sticks. I'm using Google Chrome btw.
Unless you are using photos of a human being (or you are a forum sponsor), anything that is of an inanimate object will be deleted by the mods if it is noticed.
The criteria for acceptable photos is "recognizable photo" of you.
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Yeah, that's the thing: I have used 100x100 pixel full face "recognizable" photos, but it doesn't matter, they still snap back to Tin-Tin after a short while. Therefore I assume it's a software glitch with the forum provider algorithm.
As I also mentioned, other forum members avatars also disappear, (replaced by Tin-Tin), some have non-human and human avatar pics that appear to be permanent.
I'm fine with the Tin-Tin silhouette; he has more hair than me.