Hello,
MyMoney Free downloaded from Mac AppStore is limited to 4 ledger accounts, so if you import file has data from multiple accounts then it will be dropped
You can downloaded a free version from us directly, it does not have this limitation so you can see if you import is going through. The trial is timed at 60-days
You can get it from
http://www.mthbuilt.com/download.phpThanks,