errors importing abc file

Hi all
.
I'm having intermittent problems important abc files; sometimes it works fine, but often the key signature is wrong; eg, a key of G in the abc file ended up in the musescore file of 5 sharps.

Even if the key signature imports correctly, in most files the first note is cut off; even putting in a pick up measure where there isn't supposed to be one, to accommodate cutting off the note.

Advice appreciated!
Kim