Multiple grace notes not properly spaced

Tested with MuseScore prerelease r4847 on Win7 x64.

Adding 2 grace notes (8th or 16th) to a note initially displays both grace notes with proper spacing. Once you do something else in the score, both grace notes stick to each other and to the parent note:

In MuseScore 1.1 (r4611) the grace notes are appropriately spaced:

As a side note I noticed that grace notes are not affected by changes in stretch (in either version of MuseScore).