This is one area that still seems rough around the edges. I reported
throwing out of bounds
errors a few days ago, and now have another bug, again with data import. I created a simple content type and a page for it, exported, and confirmed that the type and data are in the exported XML.
Imported it, and the type is there, but the page absent. The 'Data' step of the import reported no issues (silent failure).
Anybody know what's going on with import/export?