I have tried another PC (that has never had BC on it), loaded BC 4.6.2 (supposedly the last truly working version). NO CHANGE! I have made sure the 276cx even see's the SD Card (using the JPEG folder and JPEG test), it does. After installing the TOPO 24k Southwest (from DVD) onto my PC, BC see's it and states it is available to transfer. I go through the process of transferring to the 276cx. Once done, the SD Card shows 2 large .img files (so I assume BC did what it was supposed to do). I go to the 276cx, go to "configure Maps", IT ISN'T SHOWING as installed map.
I do have a post in the Garmin Basecamp forum. at least I'm assuming I do. The address is forums.garmin.com. I assume that is a Garmin website. No response at all!!
It seems as though BC is doing what it is supposed to, but is it completing the process?? Is it telling the 276cx to look at the SD Card for maps? Is it the software in the 276cx (it does have the latest software according to Garmin Express) that is not looking at the SD Card for maps? Seems to mean that is where the problem is, something is not communicating properly.
Mapsource works, I should (and for now will) just keep using it. My concern, as Mapsource is no longer supported, nothing is going to change with the program itself. But what happens when/if Microsoft screws up and Mapsource no longer works. If I can't figure out what is going on with this problem, then I may end up with a $600 brick (meaning the 276cx) that was purchased just 2 months ago.
FWIW, I have used Garmin products for years, have owned 7 units and still use 5 of them. I have not had any issues with any of them until this 276cx. I love my 60csx, just can't see the screen as well anymore.
I did come across the website you linked to. With 135 pages I have been hesitant. But, guess I'll just "buckle down" and go through it.