Hopefully haven't missed this already reported.
In Standard Input, select multiple files to add to a disc, using Browse for Files. The first file from the selection is always missed, however many files selected (e.g. select 2 files, only 1 is added).
I realise now I can used Advanced Input, but this form of input should also work I think.
2.5.3.0 Win 7 64 bit
Cheers