Since upgrading to Snow Leopard a few days ago, I have noticed this strange issue. I have attached a screenshot of one of the issues for you to see. this is happening on both of our MacBooks which are just a couple of weeks old. Specs are 2.13 Intel Core 2 Duo and 2 GB 800 MHz ram in both systems. Free space on the hard drives is 125 GB or so. One of the issues is upon going into system preferences and choosing the desktop and screen saver icon the available pictures to choose from are blank squares and then they populate. This was not like that on leopard. I did attach a screenshot of this in case I did not explain it right. The other issue is a bit similar in that if you open up one of our stacks and if it is showing the items in grid mode they too are just empty boxes for a few seconds. These issues are present on both macs. We do not have the same programs installed on our macs nor do we have the same setup for the stacks. Anyone have any insight?