I don't really know if this is an installation issue or not, but it seemed like the best place to ask this question. I'm running: Zen Cart 1.3.6 (upgraded from v1.3.5) and PHP Version 4.4.4 on Apache/1.3.37 (Unix).

Initially, my site seemed to work fine.

Then, today, I fired up the computer and using my Firefox browser, I tried to look at my site and got this open/download box: "You have chosen to open [blank space] which is: application/x-httpd-php from: http://www.[My Site]" But, my site was not showing up in any other way whatsoever.

I got this to happen multiple times, opening new tabs, and always having the problem. Then, I tried looking at some other sites to see if the problem was with my browser, but other sites worked fine.

Then, I tried looking at my site with other browsers (Opera and IE), and my site worked fine.

I went back to look with Firefox, and got the same problem. So, I decided to go ahead and download, and ended up downloading a file named "cipie3zu." It turns out that cipie3zu is identical to index.php.

Then, if I'm recalling correctly, I typed in the specific address, www.[My Site]/index.php, and it worked. But going back to just typing in my site name created the problem again.

Then, I closed Firefox, and opened it again. Went to my site, and like magic, it worked.

Sort of sounds like a glitch with Firefox. But, why would it work on other sites with non-specific addresses (like google.com)?

So, is the problem with Firefox or ZenCart? Was this a one-time glitch (I don't believe in them)?