As per the title - If I have enabled static content compression on the site in iis and I have the i18n module running browsers will fail to load .js files, normally on the first refresh. It is intermittent, often everything works first time in but at a later point normally on a page refresh the js files will fail to load. If I stop use the i18n module everything will start working. If I switch off enable static content compression everything will start working. If I switch them both on bang it breaks. I think that it is intermittently serving up the JS files uncompressed and the browsers choke when they try to decompress.

Windows 7 64. IIS. MVC4 application. .Net 4.5