This is tricky to describe. Controls within the filter dialog box that use the drop-down list are blank, as though the font used to display them is missing.
If I left-click in the correct position, the drop-down list then displays, so I am able to successfully create/edit filters.
The problem is that if I have lots of filters, I can't see what they do without clicking on every control to see what choice I've selected.
Nick the problem is a wrong translationof language file; I have same problem on italian version (I'm doing last release translation now)and it is solved working on field lengh