I just got my 3n1 last week.
When I originally got it, I tested the rumble on one game and it seemed to work fine. Yesterday, I try the same thing and get an error telling me that "there is no rumble pack installed." When I try and load the Opera Browser, it tells me that I must turn off the DS and insert the memory pack. The CycloDS manual claims that it patches the browser automatically to use the 3n1, but that's obviously not working.
The weird thing is, I can still load and play GBA games, and have used Rudolph's NDS Backup tool with no problems.
I have no idea what's going on here... do I need to get Dealwoot to make an exchange?