Seems that collective.flowplayer is to blame here as this line suggests:
TypeError: ("'ExtensionClass.ExtensionClass' object is not iterable",
<function Provides at 0xc2e6e0>, (<class
'Products.ATContentTypes.content.file.ATFile'>, <class
'collective.flowplayer.interfaces.IVideo'>)
As I found out http://plone.org/products/collective-flowplayer/issues/5
here it cannot be fully removed using the standard procedure.
So guess I cannot upgrade to Plone 4.0 unless I figure out how to completely
remove collective.flowplayer (remove all the marker interfaces from the
content). I guess I 'll open another thread...
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