About a week ago, the mobile version of Stack Overflow was working as expected on my Windows Phone. Since then, the menu button at the top right of the screen, the voting buttons and the 'add comments' links have stopped responding - clicking them has no effect. In a comment to this question there is a report of similar behaviour on an iPhone.
Deleting my browsing history did not make any difference.
I first noticed this on my Windows Phone 7, but I have since been able to reproduce similar behaviour in Internet Explorer 9 on a PC. This can be accessed via the 'mobile' link at the bottom of the page.
The experience that I have on the PC (with the mobile site) is described below. I understand from the comments that the mobile version is not supported on the desktop, but I have included it because I feel that the problems may be related.
When I hover over the down arrow in the top right of the screen on the PC, the cursor changes to a text insertion point "the I bar" rather than the pointing finger which usually indicates that something is clickable. Clicking has no effect.
When I hover over a vote icon, although a tooltip is displayed, the cursor does not change to indicate that the icon is clickable. Clicking has no effect.
I have also noticed some strange behaviour related to the links at the bottom of the page that allow users to swap between the mobile and full versions of the site. The cursor changes to a text insertion point when I hover over them. Also, clicking on this link in the meta.stackoverflow.com site has no effect other than to refresh the page.
Is anyone else able to reproduce this behaviour? Is there anything I can try to help isolate the problem?