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using (DeviceManager deviceManager = new DeviceManager(this))

aha, I figured out the culprit.

I am disabling the form (effectively disabling all the controls) and then re-enabling the form before/after the image acquisition. That must be messing with the Window handle being passed to the TWAIN driver?

Once I remove that, everything works as expected.

Thanks!

I'm using the 32bit CanoScan 9000F Mark II driver

Hello, I am using the sample code, specifically the AcquireImageModal routine, and my application loses focus after acquiring an image. I am activating the main form after the image is acquired, but it still results in a * window (losing focus, then activating) Is there something that can be done to...