Not much comfort I'm afraid, as I have also found Generations very unstable on importing GEDCOM.I have experienced crashes at import and at editing moves just after import; one import moved a few 'notes' to the wrong people, but this seems a one-off.
I have exported my latest trees in 'Ansel' rather than 'Ansi' but still not without hiccoughs.
However I have persisted.Once it does import properly, it brings in all the data (I've not used 'Sources') although you may have to check in the notes fields, in case it has not recognised a field title and called it 'New...'
I have tried every other program to replace Generations - nothing comes near it.
Now that Version 8.5a is available (supported in UK by TWR Computing), I am painstakingly returning my trees (with crashes along the way) from Legacy to Generations as I cannot record and reproduce data so satisfactorily on any other programme.
I hope the recent resurrection of the programme is maintained, and someone can address the import problem.