We had same problems with Fujitsu
We found a way around by selecting (WIA) scanner interface instead of TWAIN
Unfortunately AC versions 3.7.14 and above don't support Windows Image Acquisition (WIA) scanner interface, but only TWAIN
I asked AC support regarding this issue, but they are not planning to add (WIA) scanner interface to the new versions
Apparently they don't think it is an important issue
That's why I am still using old AC version