Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

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Sorry. This did no good.

That still suggests that there is a problem with the default browser if links opened via an external program aren't working.

• http://kb.mozillazine.org/Default_browser

You can also try to disable DDE:

• http://kb.mozillazine.org/Windows_error_opening_Internet_shortcut_or_local_HTML_file_-_Firefox

Thanks for your responses. No success trying the suggestions in your first link.

As for the second link, I get no error windows. Clicking on a link in Eudora just goes nowhere. I did a reinstall of Firefox to no avail. Also, I am not comfortable to trying to edit the registry.

I guess I'll just have to live with the problem, or set MSIE as my default browser. Thanks again for your assistance.