[Tigga]

That sounds like you missed the step to edit member.php in the install file, or maybe you forgot to upload it?
Check your member.php file and make sure it has these changes...

Find:
eval("standardredirect(\"".gettemplate("redirect_l ogin")."\",\"index.php?s=$sess ion[dbsessionhash]\");");

Replace with:
eval("standardredirect(\"".gettemplate("redirect_l ogin")."\",\"\$url\");");

Find:
eval("standarderror(\"".gettemplate("error_cookiec lear")."\");");

Replace with:
eval("standardredirect(\"".gettemplate("error_cook ieclear")."\",\"\$url\");");