after a relatively painless transition to my new 8-core 2.8GHz from an older G5 and from Tiger to Leopard, i seemed to have lost the ability to see the grid in the Piano Roll; however, the grid appears fine in the Arrange. hmmm? i tried assigning the "grid" key command to no avail, and also trashed the preferences to no avail. any suggestions? does anyone else have this problem? thanks in advance!