Doug, You can get some information on what's going wrong by adding the following to your 'start' script (if you're on UNIX, the Windows incantation is different and I don't know it): reldir=`dirname $0` STUPID_LOG_FILE=$reldir/var/STUPID.log export STUPID_LOG_FILE Start Zope after adding this to the top of your start script. Then look at the contents of var/STUPID.log and check for error messages relating to your instances. Chances are that your ZClass instances contain or otherwise reference instances of classes that were in a product that was not installed after you did the upgrade. Doug Wyatt wrote:

Hi,

I just updated from Zope 2.0.1 to 2.1.6. All of the Python-based products I was using previously have been migrated successfully.

But I have a number of products that I created with ZClasses. I can examine these products in the control panel, and everything is there and looks fine, but all of these classes' object instances are broken. I get this message when clicking on one in the management interface:

"This object is broken because the unknown product that created it is no longer installed or is installed incorrectly. Please contact your product vendor for assistance."

"Note that the data associated with this product has not been lost, and will be accessible again if the product is reinstalled."

I'll keep digging for documentation I may have missed, but I'd really appreciate some help.

Doug (would appreciate copies by private email as I am on the digest)

-- Doug Wyatt doug@sonosphere.com http://www.sonosphere.com/

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