OS X 10.7.2
After my MacBook is running for several days, Finder starts to refuse to show contents of some (most) directories. The file list is empty and the progress animation in the bottom right is displayed indefinitely.
Rebooting helps, but I don't like to reboot often.
I ran Repair disk and Repair Permissions with Disk Utility, but it did not help.
Any other way I can troubleshoot and fix that?