"important Updates Should Be Installed" Warning Stuck

Dear all,

since last patch Tuesday I cannot resolve WHS2011 warnings  "important updates should be installed" on

my Windows 8.1 clients.

Running Windows Update on the clients gives no new updates.

This is only on my Windows 8.1 clients, not on my Windows 7 clients.

Any suggestions?

thanks in advance

Per

PS. I deleted the warnings but the reappear after some day.