Export of content fails for one content type

This seems odd to me, looking for help to debug. I have a content type laden with CCK fields and when I try to export it I get "An illegal choice has been detected. Please contact the site administrator." with the following in dblog " Illegal choice in Pager type element."

When I export the content type minus all CCK fields, I get no error but if I add a single CCK field (as far as I can tell, any field will do) then I get that error.

It seems that I can successfully export the groups that I created but none of the various other CCK fields (text, formatted smallint, formatted smallint unsigned, and range_integer). They are simply not included in the exported text and the fieldsets that are output are clearly missing information.

I can successfully export other content types using CCK fields, whatever is going on is related to this particular one. I don't know whether it is relevant (though it certainly makes debugging difficult) but there are about 41 distinct CCK fields as a part of this content type.

I appreciate this is probably not enough information to solve the problem but I'm hoping somebody can offer advice as to how to debug short of slowly recreating this one field at a time until it breaks (I want the export to avoid work so I might just as well recreate the content type in this case).

There are a lot of other modules involved but none that aren't shared by the two content types (the one that will export and the one that won't).

Any help is appreciated!