Hi, I have a big problem with my mobile samsung galaxy ace . For about a week ago, I would download some new games that had come to Android market. When I downloaded it came up that I could not install it on either USB memory or SD card. What is strange is that I have over 6 GB left on my sd card so it should be no problem, but it does not work. I can not update my apps either. Please help me, I can't stand this any longer. Has anyone had this problem or know how to solve it? Thank you!