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i ran into the same problem.. you'll find the avatar will display right only on the site where it was uploaded to..
some of us are currently working on a full multisite setup for XOOPS at the moment and this is 1 of the key issues we're addressing..
at the moment it's a lot of manual work and there's a few methods you could use..
1 is to manually copy the uploaded avatar to each of the corresponding sites..
the other is to symlink each shared folder (not as simple a job for any1 without knowledge)
are the sites on the same server?
1 way i got round it when using ipboard on the multisite hack is to edit the actual module xoops_version file..
basically if you want a certain modules files (including uploads folder) to be common on all sites then you can make it redirect to that particular module on whatever domain you wish, i'll try explain
you have site A & site B
and a directory structure of
in root folder you have Site A & Site B
so site A has /siteA/modules/ipboard
site B has /siteB/modules/ipboard
so you want to share ipboard between both sites.. now u need to choose which sites ipboard you want to use..
we'll choose siteA for this example..
so now goto siteB/modules/ipboard
and open up xoops_version.php
find this line:
$modversion['dirname'] = "ipboard";
now from above when u see the directory structure, it's 3 folders back to the root path..
so here's the trick..
edit the line above..
and change it to:
$modversion['dirname'] = "../../siteA/modules/ipboard";
of course this has it's drawbacks in that whenever some1 on site b wants to use that module, they'll be redirected to the module on site A so they end up on Site A but at least the path would owrk for the image.. or uploaded file.. it also means your sites actually have to be on the same server too..
i'm not sure that method will work for avatars tho but it was the method i used for ipboard..
the other alternative is to edit the avatar modules code and change the upload path manually to point to the same folders..
we are working on this at mo but have to address which way we want to go with it..