So here's what happened...
Someone swore that this would work if I wanted to easily change the logo on a Wordpress theme: just download a copy of the entire site via FTP onto Dreamweaver, change only the logo file in PS and leave it under the same filename (and size, extension, etc.,) and then reupload that file alone, leaving everything else the same. (Don't touch any PHP files, etc...) So that's what I did. Everything was going so well. I just checked the FTP files on Dreamhost, and every file was there, exactly the way it originally was. The modified jpg file was in the images folder of my theme, and it was the only thing that had been changed. It all looked great. But THEN...
Typing in the URL of the actual page now only gets this message:
The connection has timed out
The server at www.talesofpublictransit.com is taking too long to respond.
The site could be temporarily unavailable or too busy. Try again in a few
If you are unable to load any pages, check your computer's network
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.
I haven't been able to find any clues anywhere about this. Does anybody have any idea what happened??