After studying several pages, it looks like the only URLs displaying the two slashes preceding the first directory following the https://{my.domain} are the css and js files rendered by gzip_loader.php. The other urls and files have the normal, path separator. I added some error logging in BxDolGzip to see at least the filepath sent to the load function. I will check the error file tomorrow after a cache refresh and see if that reveals anything interesting. Thanks.