Macbook will not return from login window

Hi,
I ran some updates on my sytem yesterday and since then when I select login window if I am away from my machine and then return, it will not come out of the login window. It does not give me the login screen even? Any ideas on how to fix this?

Probably to late but just in case....
Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them. Disk Utility's Disk Repair is not perfect and may not find or repair all directory issues. A stronger utility may be required to finish the job.
After that Repair Permissions.
No need to report Permissions errors....we all get them.
 DALE

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