Hi Jim,
We are using the old twain_32.dll(1.7) and it is having the same issue.
Our App is 32 bit application.In Win 32 it is working fine.But in Win7 64 bit ,We are not getting the MSG_XFERREADY Message.
The scanner start ,pages are scanned and after the scan is complete MSG_XFERREADY is not fired.
Thank you in advance.