I have written a C# addin for Excel using the following article as a template: http://support.microsoft.com/kb/302901
It installs and loads with Excel correctly on my machine and another (non-developer) machine.
However on another user's machine it installs but doesn't load when Excel starts.
We've all got the the same version of Excel (2003 SP3).
As the Add-in is a C# one, it's a DLL not an XLA file, so it doesn't show up in Excel > Tools > Add-Ins.
Does anybody know what I need to do to get the add in working on this other machine? Let me know if you need any more details.