Just installed ArcSoft's PhotoImpression 6 (V 188.8.131.520 which shipped with my VuPoint 21c WM-FC-VP Digital Film & Slide Converter. Immediately, I knew there was a problem, because the VuPoint User Manual says to "calibrate before each use," however, the calibrate function (which is apparently supposed to be automatic) seems to be inoperable (greyed out).
Of course, I assumed the issue was with the PhotoImpression software. I then called the free support number at ArchSoft, and their (very polite) tech immediately diagnosed my problem was a driver issue.
Unfortunately, ArcSoft does not provide the driver -- because it is hardware specific -- and supplied by the hardware manufacturer: VuPoint. I asked if he had a support number for VuPoint (none given in their user manual...), and he suppliled a tech support contact number at VuPoint (626-839-5175).
Called VuPoint and found they are aware of the driver problem -- and have a fix (includes a "manual" calibrate function not included in the original Software CD shipped with their product) and they will mail it to you free (files too large to download, according to their tech support person...).
So, if you have this "calibrate" problem too, do call the VuPoint support number above.
[Since I just ordered the fix today, and have not received the updated CD, I cannot say if this "fix" actually works; however, when I get the updated version, I will post the results. ]
Just wanted to let anyone who is having this problem know that it is not an ArcSoft issue.