Recode fail with Makemkv 1.9.1 (w64bit)

After upgrading from Makemkv 1.9.0 to 1.9.1 Nero Recode 14 will no longer transcode the mkv files (to any other format). The files open fine in the recode preview window, and can be trimmed, but when encoding starts it gives message "Nero Recode cannot transcode source file because it is not valid or damaged". Have updated Recode to version 15.0.27001. Unfortunately Makemkv forced me to upgrade from 1.9.0 (which worked fine before with Nero Recode). Checked the mkv files with VLC player, and they play fine all the way through, so no file errors. Also tried multiple mkv files.
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