This was not fully fixed in the last release. I have a database of about 230K hands and upon export and re-import I was off by about 1K. I don't have the test d-base to send because I deleted it, but you may want to dig deeper into this.
Also, the export created a ridiculous amount of files. Many of the files only had a single hand in them. 8700 or so files for 230K hands.