coveo search link is not visible
Suddenly coveo search link is not visible in sitecore contral panel.
I installed coveo for sitecore 4.0 in sitecore 7.2, configured and indexed. Suddenly it disappers, but still am able to index coveo. Able to get results using coveo search API, CES is also working fine and able to access CES admin page.
Please let me know, why it disabled and is there way to enable the coveosearch link.
The links in the control panel are in fact items in the Sitecore core database. Have you restored a backup of your core database from before Coveo for Sitecore was installed?