Peter good to hear it works with the USB cable, that clears the bike and places the problem with the WiFi interface and or your browser, I avoid M$ browsers due their problems as do 80-90 % of people using my 650GS web site
Re the distance between WiFi and Tablet, the distances quoted to you are not correct, I use it over far longer distances without problems, When at home base I have the tablet and GS911 WiFi communicating via the home WiFi system. Where a garage is on the limit of coverage for the main home network you can use range extenders, preferably with 5db antenna's like this one
http://www.tp-link.com/lk/products/details/?model=TL-WA801ND they are so low in cost these days, you can even use a WISP router to create a sub network in the garage to isolate from all those pesky devices in the house
The GS911 works so well linking into the home WiFi net that I can set up real time recording, go out for a ride and it auto logs in on my return