When doing a quiz, you can navigate to previous and next questions using hyperlinks for (prev), (next) and the numbers of the question.

But when you work in Internet Explorer (tested with 7), and change the zoom factor of your browser (Ctrl +), two problems occur:
1 - the line with these hyperlinks is corrupted (all intermediate spaces have disappeared)
2 - the hyperlinks are no longer in the same place as the text

Basically, navigation in the quiz is not possible when you change the zoom factor

I tested this with Firefox 3 also: no problems
I installed the latest Moodle 1.9.2 to make sure it was not fixed already, but the problem can be reproduced in that version as well.