Hmmm.
Okay. Start making a list of what is different between your other addins
and this one.
1. Directory path where addins are stored
2. Addin name (length, any special characters, etc.)
3. Encryption used (is it different than the others)
4. Password required to open?
5. Properties (anything weird in those fields?). Look both in the VBE
window for all modules (including worksheet and ThisWorkbook) and in the File
| Properties of the Excel window.
6. # of modules?
7. size of modules?
8. # of lines per module
9. Is VBA code protected with a password?
10. Is your trusted certificate in the wrong place? Is it damaged?
11. Non-VBA related things (like do you have 2 pivot tables on one worksheet
tab), etc.
12. anything else I am not thinking of right now -- sorry
Use this add in (
http://www.mztools.com/v3/mztools3.aspx) to gather some of
the info above. It is free thanks to Carlos J. Quintero. There is a
"Statistics" option in one of the icons/drop downs. Run Statistics, copy and
paste that info into an Excel worksheet and compare to your other addins.
There are some recommended "self imposed" limitations regarding size of a
module (% and # of lines). I don't recall what that "limit" is at the moment
(your modules may be small, so this is may not be an issue for you. If your
addin is less than 500 lines per module, ignore this sentence).
Don't forget to compare to your other addins. What is different? Keep
looking for the difference until your find you problem.
I hope you find your issue. Good Luck.