I have an Epson v500 and whenever I go to scan negatives I turn digital ice on and press preview. After the preview is done digital ice gets automatically turned off. Is this normal and should I be manually re-turning on digital ice before scanning fullsize?
What type of film are you scanning?
ICE uses an infrared channel to detect defects, and some films (notably ALL traditional B+W films and kodachrome) won't work with the technology.
If you've set the scanner to B+W film it may automatically disable ICE?