“No posts matched your criteria” permalink problem..on just one browser

The situation:

I’ve used a modified version of “The Future Is Now” plugin to let my users at this site discuss unpublished posts–ones from the future, that is. It works great on Firefox, but…

Under IE 7, users who click the permalink receive this error: “Sorry, no posts matched your criteria.” The links are simple format, along the lines of http://www.website.com/?1432

I’ve heard of a bug in 2.6.x that causes this to happen, but nothing seems to work for me to get around it. I’ve tried different permalink structures (http://www.website.com/2008/fred), and those return 404 messages.

Anyone have any ideas? 🙁