Check IDEfixPrefs. Change settings from "auto" to what you actually have.
Also check startup-sequence. Make sure that only one IDEfix program is called, either LoadIDE RESET or IDEfix. And only once. (If you want >4G support you need LoadIDE).
To work with CF cards you might also need this: http://www.doobreynet.co.uk/files/am...ix_patches.lha