Did you make sure to go to the upgrade.php page after the upgrade was done to insure that the DB was also properly upgraded?
If you already did that, or it doesn’t seem to help, sounds like maybe your permalink structure didn’t come over properly. Do you use a custom permalink structure? Try setting it to something else, verifying that it all works as it should, and then try setting it back to what you want.
That may “unstick” something that didn’t get migrated properly.
I seem to remember some funkiness with permalinks and IIS, now that I think on it further. Something about it not supporting mod_rewrite or something like that? Anyway, I would imagine that the issue has something to do with the permalinks, because that is what is used to display a single post. Maybe I’m telling you stuff that isn’t helpful. ?? Anyway, maybe it will help you narrow stuff down.
Also, you may want to turning on the default theme just to verify that you aren’t having a theme problem. Doesn’t sound like it, but it could be.
Verify that your plugin’s aren’t causing the issue, by turning them off and turning them back on one by one.
Sorry Hazzie, wish I could help you more… Best of luck.
Cheers,
A
