[Osbes]

@giorgino
The feature to use forums custom icons is builtin in vBulletin 4. You can add to every forum an own imageprefix, so it will use forums custom icons. If you use the vBulletin imageprefix for your your forums, these icons will instantly added to the sprite.

If you want to further use the Forum Category Icons addon, i can create you a plugin, so this icons will also added.

But i would advise you to use the builtin solution from vBulletin, so you didnt need an extra addon and an extra plugin from us on top of this.
This could make your workload during every vBulletin Update easier (less addons and plugins = less problems)

###

@klaus
Can you send me the output, when using an absolute path, via PN? This would help me finding the problem

Best regards
Sebastian