Grace notes too big (regression)

From jfrank57: http://musescore.org/en/node/1297

"When inserting any type of grace note, the grace note is inserted too big (ie; normal note size). If I then adjust the grace note's staff position up or down with the arrow keys, then the size changes to the correct small size. If I then add a slur to the next note, the grace note size will pop back to normal note size.

This occurs on pre-releases since 1619 but pre-release 1598 seems to be OK. I'm running on Windows XP SP3."