gonna put this here for anyone if they look through search or something because i did and it also seems like multiple people are getting this issue
DSI FLIPNOTE STUDIO CRASHING WHILE BROWSING SUDOMEMO???
(you will need a pc or something with access to your dsi's sd card to fix this)
Step 1. Make sure the rom you have is from the same region as your DSI.
If you have save data on your DSI from another region of Flipnote Studio, it should be stored on your SD Card under
romLocation/saves/Flipnote Studio (REGION).pub
orromLocation/saves/Flipnote Studio (REGION).pu# <- (number)
. I strongly recommend you make a backup of your save file before continuing.