If the add-in is not loaded then check the macro settings on that machine.
Also, there may be an issue of missing files on that machine or a compile
error in the add-in when load, if the add-in is a PPA.

Signature
Regards,
Shyam Pillai
Animation Carbon: Copy/Paste/Share animation libraries.
www.animationcarbon.com
> We have a problem with a customer trying to install an add-in on
> Powerpoint
[quoted text clipped - 10 lines]
> and
> solve this.