at default MonoX demo site, there seem to be two cached gravatar images, one for admin and other for rest of users. Those are in /MonoX/ApplicationData/Cache/Gravatars folder

admin:
http://.../MonoX/ApplicationData/Cache/Gravatars/62e627d9350f3a816956643735e6ee0c.jpg

other friends:
http://.../MonoX/ApplicationData/Cache/Gravatars/3160f81e34f2ef827557f1b30febd77d.jpg

At http://.../profile/admin/ it uses
http://www.gravatar.com/avatar.php?gravatar_id=3160f81e34f2ef827557f1b30febd77d&rating=G&size=80&d=http://...MYDOMAINHERE.../App_Themes/Common/img/avatar_blank.jpg
and it works fine

BUT at page http://.../MonoX/Pages/SocialNetworking/Wall.aspx it uses those but they show a broken icon. I can't even visit those URLs (with my domain at ... of course) from the webserver machine itself with http://localhost. If I use file:/// it works at localhost.

This seems to be related with the issue with have with pages taking a long time to show up (not seeming to get cached or waiting for some timeout). I believe there is an access rights issue to the cache folder but I don't understand what. This prevents it to serve the cached gravatars and also seems to make pages come up very slow (they first check the cache and wait for some timeout or have exceptions there that slow it down)

Also another question is why in the above pages mentioned, one is getting the gravatars directly while the other tries to take them from the cache?