joiner non-functional

I am attempting to build a single edited file from two bog standard .mpg files. The cuts are added to the joiner list in the usual fashion, but 'create video from joiner list' doesn't output anything after the output file name is entered.

The VR log has one additional entry after attemtping the joiner output - a message about opening the first item in the joiner list in quick stream fix mode. A separate QSF of the first source item reveals no issues.