It seems that the MusicXlm in biab is a bit flimsy !

A fairly standard melody in my Sibelius 7 - having a first and second ending with a repeat in the first ending - exportet to MusicXml.
Reading the exported MusicXlm file into biab - no signs of repeat or first and second ending.

Opening the same MusicXml file in Myriad's free Melody Player: "http://www.myriad-online.com/en/products/melodyplayer.htm" shows repeats and first and second ending - everything is OK.

Now open the biab demo-file "...\bb\Tutorial - Repeats and Endings\repeat Tutorial Example 3 -needs 5X repeats at bar 5-6.MGU", and save it as MusicXml, then open the MusicXml file in biab - no signs of repeats and the chords are mysteriously changed.

Dear PG-Music - that can be made much better.