Howdy John,
Actually the maneuver that you tried - Selecting the regions and using the "Shift + arrow key" - should do it. However, if you have different notational figures that would start crossing barlines and such, Composer might not like doing it that way. This sounds like the problem you've run into. (If you could please attach the file above, or send it to me directly at
support@notation.com.)
How about rather than shoving all those notes around, we just insert a half measure? You can do that, and then shift barlines if you need to.
Or perhaps shifting barlines is all you really need to do? To shift the barlines, select Staff Symbols/Barlines, and then the button with the two black right-pointing arrows on it. You'll get a red dangly-thing on your cursor to position in the score where you want the first barline to go. When you click your mouse, a barline will be place where you click, and all the score that follows after that will be right-adjusted according to the time signature.
Do let me know if any of the above helps
ttfn,
Sherry