I once fixed a similar problem by:
Logging off first.
Then clearing the browser cache. This can be done in the following ways, it all all depend on the browser you are using:
Google Chrome – Hold SHIFT and then press F5
Mozilla Firefox – Hold CTRL and then press F5
Internet Explorer – Hold CTRL and then press F5
Opera – Hold CTRL (or shift) and then press F5
Safari – Command+Option+E (will empty cache) then Command+R will reload page.
And start with a fresh login.