degrub,
I'm using Mac OS 10.11.6 (El Capitan) with 24GB RAM. No issues with using Silverfast without iSRD; only iSRD generates the error. I did try reseating the USB cable on both ends (no difference), but I have not tried replacing the cable. Devices are not plugged into a power conditioner or UPS, just a standard surge protector. As far as I know, there is no ability to run iSRD later unless you purchase Lasersoft's $100+ iSRD standalone tool (which I'm not inclined to do).
Good idea to try Vuescan. I tried two test scans with Infrared Clean turned on (Light and Medium). No problems! So that would appear to rule out the Nikon scanner as the cause of the error. I had the impression that Vuescan’s quality wasn’t as good as Silverfast, but these tests aren’t bad, so Vuescan might be my fallback solution if I can’t fix the Silverfast error.
Mark,
I hope you are right about Lasersoft support. I have had only negative/unproductive experiences with Lasersoft support, particularly with Silverfast 8. Also, Lasersoft's forums are strictly managed/filtered (my troubleshooting questions are always disallowed/deleted), so that's why I posted here (in case other users have encountered the same issue). The fact that I'm now getting the error on three different "r" revisions (6, 11, 12) spanning over several years makes me less optimistic that Laserfast will offer a solution. We'll see.
Thanks for running your test. As I said, I had no problems either for the first 50 slides or so, but then the error just popped up suddenly. I suspect some Silverfast file is becoming corrupted over a period of time, but that’s just a guess. I wonder if the uninstaller is missing some files that are corrupted, leaving the problem in place when I think I’m starting with a fresh install.
EDIT: I just tried Silverfast again (after my successful Vuescan test) and got the same error. This would suggest that there isn't a hardware overheating or loose wire problem with the Nikon.