Problems with "Pages Titles" dashboard widget (1 reply)

I have a problem with the "Page Titles" dashboard widget. If I click on "NEXT >" or on a column header to sort or try to change the number of lines I only get the animated graphic and "Loading data..." but nothing more. – I don't have these problems with the other widgets.

What's wrong?

My Piwik installation runs on Apache/2.2.15 with PHP 5.4.17.

Thanks,

Gunther