Lost images/avatars in site upgrade

Hi --
I've upgraded to WP3.0 and BP1.2.4. I understand that losing avatars isn't uncommon but the fixes posted on the BuddyPress support board aren't working. Weirdly some images are showing up and some aren't (I turned off my cache plugin thinking that was accounting for some wonkiness?).

Anyone have a fix? This is incredibly frustrating and also looks like hell. Argh.