This has been driving me nuts so I'm hoping there is someone here who can help. I have an R4 Ultra DS cart (http://www.r4ultra.com/) and have had it for around 6 months. I have had no problems whatsoever with it (got around 80 games on it) until now. I have recently tried to play Korg DS-10 on it and it loads up all fine, and I can get some pretty cool sounds going on it but when I go to save it freezes EVERYTIME. I have tried to find the solution on the net but haven't been able to find anything. I have also tried to contact the above website on card specific help but with no response to date. BTW, I have the latest firmware too (1.54). Every other game works 100% perfectly so it has me stumped what is happening. I am using a 4gb Kingston SDHC card. If you know what I can do to overcome this I'd be very appreciative. Cheers.