RE: Consolidated financial reports:
If theres only 2 business units, You can try to change the filters, in 1st column Business unit leave "A"
and in second Business Unit change to "<>A"
Retested in my consolidated company and it should work, but if You have some customizations, who knows what has gone wrong.
When looking at the results, You can click in a cell where should be values, and You can check the filters and if system finds any entries. Maybe You have run a closing, and zeroed all company A transactions ?