How can I troubleshoot a Lion MacBook in Japan that I can't "Back to My Mac" to?

Our family lives in the United States. My wife's parents live in Japan. We gave them a MacBook and have been remoting connecting to it via screen sharing. At first, I was just connecting to it directly via its IP. I was using the deafult host feature on an AirPort Extreme Base Station for this, but the base station would occasionaly crash and would have to be power cycled to get it working again. So last year, I decided to connect to it via "Back to My Mac" so I could just use DHCP and didn't have to use the default host feature. This worked well for a while, but over the past couple of months the performance has been poor and now I can't connect at all -- even though the machine appears in the sidebars of my other Macs.
FWIW, I'm using Mountain Lion on all my other Macs and their MacBook is running Lion. I've noticed that Back to My Mac creates a VPN connection to your other Macs and I assume that this is what was causing the performance problems I noticed a couple of months ago.
Also, my wife's parents are elderly and not computer savy at all so it's hard to get them to do things over the phone. If anyone has any insights on troubleshooting "Back to My Mac" screen sharing issues, please let me know. Ports to ping, diagnotics to run, etc.
Thanks fo the help!

Hi Mike,
No sign of your photoshopped image, so I'm guessing about what you want here.
Does this resemble what you're looking for?
Column B contains the initial entries (made from the keyboard). I wasn't expecting to see the trailing zeroes retained in these.
All cells in columns C and D contain the formula shown above the table, =B, a simple cell reference to the column B cell on the same row as the formula.
Column C's format is left as the default "Automatic". As can be seen, all trailing zeroes are removed.
Cells in column D have had their format set as shown in the Inspector pane to the right of the table.
The value in these cells is still the same as the value in column B, and that is the value that would be used in any calculations referencing these cells. Formatting affects only the display of the cell contents. What is displayed is the value in the cell, rounded to two decimal places.
Regards,
Barry

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