Generic batch conversion aspect ratio bug

after testing the generic xvid profile on single 16x9 aspect files & getting good results, I set up a batch of them.
but only the 1st file of the batch has come out right - the remainder have the wrong aspect ratio. i.e. they look too tall & squashed.

I’m using version 4.0.5.0. & xvid +audiocopy 2 pass.

is this a known bug & has it been fixed in later versions or is it still outstanding - if the latter, is there any workaround, other than only do one file at a time ?