Why do I get Internal Error in FrameMaker 8 when export imported XML file

Hello,

I round trip a valid SFM book, i.e. Save it As XML and Import the XML back to Frame no problem.

But when I Save the imported book as XML again, I get Internal Error in Frame followed by Memory Could Not Be Read error.

I get these errors on 2nd export for every book that I have on two computers.

Any ideas on how to fix it?

Thanks alot,

Vadim

Please see screenshots.