[Zope] Refresh-Product

[Arenz, Ralph]

Hi,

i have a question about the refresh product.
After i installed the product it works fine,
for a while.
At present there is something strange.
After i had refreshed my own product for a few times
(without any changes of the .py file) , it
appears as a multiple entry in the add-Product list box.
If i restart the whole zope, what i would prevented, the multiple entries
will reduce to one entry. 

Has anybody an idea what's going on? 

Ralph