[Zope] May be a problem with ZClass

[Luis Martin Arganaraz]

Hello everybody.
My problem:
I made a product with ZClass technology. I don't know why every time that I 
start Zope, an old version of my product appear. The unique information 
that I could find is in the file "stupid_log_file.log". This is:

2002-05-27T14:01:46 PROBLEM(100) ZODB Could not import class 
'MixGraphClass' from module '*Z70QZ0TZA5T3p/X/EFDKrA=='


Before this problem appear the product work fine, and if I re-import the 
newest version after a start, the product work fine too. So I don't have 
any idea of what is happening and how I could solve this situation. I 
didn't find anything in the newest version that didn't be in the older 
version that suggest me a "code error".

Can someone give me any suggestion?

Thanks,
Martin