connect your phone via usb open an adb shell and type:
adb shell rmdir /data/local/tmp
adb shell mkdir /data/local/tmp
i thought that this issue was solved in version 1.1
FYI i flashed xxkp9 new firmware on galaxy ace found at tsar3000.com and when i run the apk the sd card stays mounted i'll wait to see what happens
edit: not working