Tried this last night:
– built completely new machine with clean OS
– installed clean the minimum stuff required to run wordpress on Apache under Ubuntu 12.04, including a clean mysql… no plugins other than what comes with it and the import tool.
– created new databases for wordpress to use
– passed all the obvious checks for functionality
– exported my blog to an XML file with the wordpress exporter
– imported into clean environment
– updated the post that is linked above to eliminate the inserted domain name
The bug persists on the new system.
It does seem to be related to the total number of characters in the post up to the point it appears since I can make it move around with insertion of HTML comments. Given enough jiggery-pokery, I can make it land inside comment tags, but that’s a real PITA to do.