I recently have had problems with both the Minolta software (ver. 1.1.5) -- the same "unknown error" that others relate. More interesting (and a much bigger hassle) is that the reason I was forced to try the Minolta software after replacing it with Silverfast AI ver 6 (MUCH better, especially for B&W) after using it very successfully for 3 months, it just stopped loading two days ago giving me an error message (from Photoshop 7) "problem with acquisition module interface." This has only happened since I "upgraded" to Mac OSX ver 3.3.8. This leads me to wonder if the problem is with the scanner firmware. Now I am overseas (in NZ) in the middle of an enormous job, I won't be back until May, and I'm stuck unable to scan a gazillion images for the job. I have been quite happy with this scanner until now, but Konica Minolta support hasn't even bothered to reply to my queries. This sucks! Any help would be much appreciated...