And every time? Wow. You should go onto the mnsg server and pad your stats with those guys.
In reality though, that sucks! It must be a bug. I've actually run into a server that had invisible bots. I'd guess it is with the 420 patch.
I assume you're using the default skins? Do you have the "force default skin" checked or anything?
Try a forum search for "invisible" or "invisible skins". I've seen something on it posted.
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LoL[Morety|PuF
The More-tician. Bringing up the dead (topics).
]LoL[ - Strength, honour, nekkidness and beer.