Looks like there is a coding problem in your single.php page.
Without seeing your code, nobody could truly answer that question.
Perhaps you could post the code from your theme’s single.php over at http://wordpress.pastebin.ca/ and then post back here with a link to it so someone might have a look?
Or, regress back to the original single.php that came with your theme.
I don’t remember ever messing with it. How do I revert to the original single.php file? I’m willing to try that.
Well, either someone messed with it or the theme came from the author broke!
To get the original single.php, get the theme from whereever you originally got it, unzip it, and upload just that file to your theme’s directory.
And if you’ve done that and it’s STILL broken, upload the single.php from the default theme.
You should have a backup copy of your theme on your computer, shouldn’t you? (just in case = cases like this 🙂
So, uploada an un-altered copy of that single.php file.
Wait, I messed with it. I took out the “comments” thing. Thanks guys.
Now that I have the original single.php file, how do I upload it?
FTP? That’s the usual way to up and download files to/from a server.
How did you get files there first time?