I don't have a PDF with 1000 pages to test. Please start gscan2pdf from the command line with the --log option, reproduce the problem, quit, and post the log file:
gscan2pdf --log=log
I don't have a PDF with 1000 pages to test. Please start gscan2pdf from the command line with the --log option, reproduce the problem, quit, and post the log file:
gscan2pdf --log=log