Invalid URL

This problem happens only after the upgrade from 1.1.20 to 2.1Patch1.
Can someone give a hand?

The situation is, when a web page, most likily a new web page, is
requested, the squid generates the following error. However after
clicking the refresh or reload button a few times, typically 3 to 4
times, the page will be loaded properly. Thus confirms that the URL is
right. It is just something wrong with the squid. Because the problem
is so often, many web pages are only partially opened. Some of the
pictures and buttons in the page need to be re-loaded individually.
This is very annoying.

To simplify the case, I stopped the re-director process to no success.
The squid.conf is pretty much the defaults suggested. Please give a
hand.

Here is the error message. It is the result of clicking a link of
another web page. As usually, after re-loading 4 time, I get the entire
web page successfully afterwards.

ERROR

The requested URL could not be retrieved

While trying to retrieve the URL: /newspaper/gbindex.htm

The following error was encountered:

      Invalid URL

Some aspect of the requested URL is incorrect. Possible problems:

      Missing or incorrect access protocol (should be `http://'' or
similar)
      Missing hostname
      Illegal double-escape in the URL-Path
      Illegal character in hostname; underscores are not allowed

Generated Thu, 26 Nov 1998 01:47:07 GMT by proxy.ans.com.au
(Squid/2.1.PATCH1)

-- 
Regards
Clement
ANS Communications Pty Ltd