Horizontal offset lost in text frame
I'm new to MuS and still feeling my way so apologies if I am missing something obvious.
I have a text frame placed towards the bottom of a one page score to hold a third verse for the hymn setting above it. The frame auto stretches across the whole page so I set the horizontal offset for the text such that it stands in the centre of the page and save the file. All is well until I reopen the file when I find that the text offset appears to have doubled and my text is far to the right of the page.
Am I missing something or could this be a bug? Score attached, pdf as it should be, mscz showing the bug (I hope). I'm running MuS 2.1 871c8ce on OSX 10.12.5 (16F73).