Twain Doesn't Work On My Win 7 64-bit Options

[epizz1]

I finally made the jump from XP to Windows 7 64-bit.

I installed PMView 3.64 64-bit and everything works fine, except I cannot acquire from my Canon 8400F scanner, which also has new 64-bit drivers.

Neither the Select Source nor the Acquire menu choices do anything when I click on them. I confirmed that TWAIN_32.dll is in the Windows directory.

Other programs, such as the Canon Toolbox, Pixwizard, and Photoshop Elements, use the twain driver with no problem, so I don't understand why PMView, doesn't. I use PMView constantly, so it's a little inconvenient to have to use a different program to scan.