In my Share Point 2007 server farm there is more than 150+ site Collections are created but in one SharePoint Site Collection there is some problem from this evening:
Advanced Search button is missing from that site collection home page,
Create Page option is missing from Site Action menu,
Modify Pages Library Setting is missing from Site Settings under Site Action menu,
Modify Navigation option is disabled under Site Setting under Site Action Menu,
In People and Groups page, Share Point groups are not coming, to access those groups have to click Group option.
All above problems are coming only one site collections rest sites are working fine. Kindly help to get me out from these problems.