Test 5 checks the integrity of your SH3 1.4b installation and if modified files are found the test will fail. Basically, your install is not clean & unmodified.
Take a look at this post -
http://www.subsim.com/radioroom/show...postcount=1480
It should help. Please note, the links for the GWX Hompage no longer work, however the files are available from my sig.
Good Luck