Thank you. I resolved.
Removing "On Error" statements did not modify add-in execution because no
error event occurs: cause of the problem was incomplete uninstallation of
add-in previous versions from the VM used to test it.
After a manual clean of some registry keys, after a new setup add-in works
better.

BUT there is another problem: only users with administrators privileges can
use it.
A MS support document (
http://support.microsoft.com/default...b;EN-US;290868 ) state that
setting registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Excel \Addins\MyAddin.Connect

value to 3 must resolve, but it didn't.
Regards,

Maurizio

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BELLANTONE MAURIZIO - Teacher, IT Consultant, Programmer
SPINETTA MARENGO (AL) - ITALY
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E-mail: bellantoneCHIOCCIOLAlibero.it
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"Peter T" <peter_t@discussions ha scritto nel messaggio
...
Hi Maurizio,