When a 32-bit TWAIN aware application scans using a WIA driver on a 64-bit Windows Vista or Windows 7 system, the TWAIN application may stop responding.
If you leave the scan dialog open for about ten minutes before you push the [Scan] button, the message used to transfer the scanned image from the WIA driver to the TWAIN application is not sent to the TWAIN application.
This problem can be avoided by doing either of the followings:
- Scan image soon after you open the scan dialog.
- Use a WIA aware application, not a TWAIN aware application.
This behavior is by design.
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