Deleting portal DB users in EP6 SR1

Hi

When we try deleting database users under User Administration->Users(a few users have the same userids in portal DB and MS-ADS) in the portal we get a User Management Exception. (We get the same exception with user administration using http://<server:port>/useradmin).

When we go back to Search under Detailed Navigation in the portal we get the following error message:

"The iView has timed out. There is no cached content to display.Click 'Reload' to retrieve updated content. You may need to wait for the cache to retrieve the content from the source. Reload".

I tried setting the property but it didnt work.

Any idea these issues fixed with SP Stack 10?

Thanks in advance

Premal