Same problem occurs with Canon Pixma MX870. I am using simple scan 3.6.1 on Ubuntu 13.04. I would be happy to provide additional detail if that would help solve this problem.
By the way, the s/w doesn't quite wait forever: after several minutes it times out and allows me to save the scanned document. One workaround that I would find tolerable is to have a shorter timeout.
Same problem occurs with Canon Pixma MX870. I am using simple scan 3.6.1 on Ubuntu 13.04. I would be happy to provide additional detail if that would help solve this problem.
By the way, the s/w doesn't quite wait forever: after several minutes it times out and allows me to save the scanned document. One workaround that I would find tolerable is to have a shorter timeout.