Are you using Firefox to access the webadmin?

It might me a browser problem, not a server problem.

Try these:

• Clearing your Firefox cookies and cache (press Ctrl+Shift+Del and select them to be cleared)
• Resetting your Download Actions:
  1. Close Firefox
  2. Open the Firefox profile folder - see How to find your profile
  3. Delete the mimetypes.rdf file
• Checking your Internet security software (this includes antivirus and antispyware programs, firewalls, and more):
  • In general, open the program's settings, remove Firefox from its "Allow" list, and then let it redetect Firefox.
  • If your program is listed at the Firewalls article here, or at the Firewalls article at MozillaZine, you can get specific instructions for how to properly reconfigure. Follow them carefully.
• Making a new Firefox profile (see Managing profiles). If that works, you can get your bookmarks and passwords into the new profile by following the instructions in the Recovering important data from an old profile article.

Sometimes Firefox will try to download PHP files instead of load them as web pages

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