A quick Googling shows several threads on different forums, including Gmail help forum, where several users have complained about the same. Most of these users complain about Gmail’s non-stop loading and non-display of messages even after signing in. One such complaint goes like this As you can expect with any Google forum, there haven’t been much help from Google, but in one of the threads, a Google employee has suggested this solution- There are no clear indications available for the cause and pattern of the issue, like when using a particular browser or while using a particular OS etc. Those who are experiencing the issue can try the above temporary solution and might have to wait for Google to actually find the root cause and provide a fix. Using the Basic Version isn’t a fix, but as a workaround it lets people read their e-mail while we wait for Google to fix the root-cause.