I use a V750 and did not have any instability probs so far. Previously one of my 1TB Datatanks (FireWire) caused a problem with my FireWire bus which caused my Scanner to fail sometimes. But that vanished after switching to USB. The Datatank draw far too much power from the bus. So now SilverFast is stable. That did not change with the r5 update. I never had any problems with vanishing icons neither. I scan negs with a prepared maskset I saved as a preset in my Ai Studio. And the soft zooms into any active frame when I click the zoom button. My framesets also include the necessary resolution. I set that individually for any individual scan anyway. For prints I do not need more than 300dpi anyway, so I only raise the res for scans into my archive. With my soft (I also checked demo mode ;-) ) the buttons all do work. Maybe the previous poster set his scantype to an HDR scan, which is some kind of raw format and is supposed to do that. There is an uninstall script in my SilverFast folder but I have not tried that so far. Would be nice if Apple would some day invent some kind of software manager. Would make life much more easier. | 
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