Before version 0.48, I could assign the same stroke width to a group of paths. Now there are "issues"

Here's a sample file for your convenience. Try to change the stroke width of the petals, as a group. Here are my observations:
- On the Stroke Style tab, the width of the group is shown as 0.00.
- Using the down arrow is impossible because it's grayed out.
- Clicking up arrow, width value stays 0.00, but on the canvas, the stroke has been reduced to something close to 0.1 or 0.2.
- Highlighting width value and typing new value, works normally.
I can change their fill all at once without problems. Also blur and change opacity. The stroke color can be changed, but not without problems.
My observations when changing the stroke color (either right-click palette, or using Stroke Paint tab):
- The stroke width value changes from 0.00 to 2.00, even though the width does not change on canvas.
- Down arrow changes value from 2.00 to 1.90, and on canvas, the actual widtch changes from 1.00 to 1.90.
- Up arrow, value changes from 2.00 to 2.10, and on canvas, width looks to be 2.10.
Can anyone confirm? Should I report this? I searched Launchpad and didn't find anything related. I'm on Windows 7, 64-bit, if it matters.
Thanks for your help

Edit - related note
If any 2 paths are selected, the width value is 100.00, despite what are their true widths.