Hey fellas, I'm the guy that started the compatibility list. It's being actively maintained by several good folks now.
I can personally vouch for Blaster Master working so it could be your cart needs more cleaning.
I've also discovered that some of my games have broken tabs like this:
Look carefully and you'll see the tab on the left is broken.
These games work in my front loading nes but not in my Retron 5 (without some wiggling).
I took a good cart and can show you side by side what's going on.
There are two plastic tabs inside the cart shell that hold the board in place:
If either tab breaks like pictured above your cart will seem to be fine. The board is no longer stable but the amount it can move is practically undetectable until you open the cart.
The nes front loading mechanism either doesn't push the board out of place or the connector might simply be more forgiving about how the pins need to line up.
On a top loader like the Retron 5 however the board will almost always slant like shown in the picture. This slant is enough to misalign the pins causing your game to not get detected correctly.
Regarding the Game Genie...
The latest game genie codes work in the latest firmware but they are separate downloads.
You can edit the cheats file directly. Word of warning: it's huge. Too big for notepad.
You really need an XML editor with a search function.
I also wrote a follow up to my initial review here:
http://vgcollect.com/forum/index.php/topic,5017.msg63885.html#msg63885I plan to write another one before the end of August.