I was just double checking if your PowerShot G16 will work with Canon Image Gateway. I think it should. I am not sure if the following is of any help, but my Canon Rebel T5i has NO Wireless Connection Capability. I use Canon Image Gateway to Upload...
I logged into Canon Image Gateway after a frustrating week. It was working for me last night and this morning, 24 June 2014.However; sometimes the login took a couple attempts.
I am RickWat and I am having the same problem. I did contact Richard, Canon Technical Support Representative at "Canon Support - EOS Camera". AS of 19 June 2014 at 6:09 PM Richard Replied to me that: "Thank you for contacting Canon product support ...