Strange...
Doesn't happen with Gray Fox or Mega Man.
For the time being, just leave the CSS instead of deselecting Lyn.
I'll look into it more.
I'm glad to see Gray Fox is working well, although I thought I should inform you of a possible glitch possibly related to Lyn. After using her in a battle I played as megaman and his animations went back to Ness' default one. I tested this out a few more times with the same result and ended up deleting Lyn only to find out that it Megaman went back to normal. Sorry about the block of text, just thought you should know.
Odd............
First, check to see if you are using the updated MotionEtc.
Lyn doesn't have to do with it.
What you're experiencing is a unique SD Card related issue, like the one I had when PM's Skyworld was all black and a BRSTM was playing another song.
Check your SD card, copy EVERYTHING to your desktop, format, and paste the backup in the SD card.
Problem solved.
Oddly enough, Gray Fox works perfectly in SSE....