[BScout]

Nothing is wrong with Pro Tools internal bussing.

I think we've already gone over this before but internal bussing has nothing to do with "Film mode" setting. That only has to do with output order. Internally, Pro Tools only operates in one mode. Always.

For surround channels, the order Pro Tools chooses to use is surround 5.1 goes to Rsr and Lsr and not Lss and Rss. In your bussing (bus i/o), you can rearrange the subpath you address to Lss and Rss instead for surround/5.1/5.0 subpaths. That is the easiest way. Then output to that subpath.