I have the same problem. I was playing with the DS2x86 emulator and when I restarted my DSi XL it didn´t show up the Alex Rider icon anymore. I tried the SC2 on my DS Lite and it freezes completely just after showing the health warning.
Edit: After some time with the DSi turned-off the Alex Rider icon appeared again.
Edit: After some time with the DSi turned-off the Alex Rider icon appeared again.







