typically when you get this kind of behaviour it means that the data model either 'is wrong' or 'does not allow' what you are trying to do, depending on your perspective.
If you have the physical model;
Dimension 1 - Fact 1 - Dimension 2 - Fact 2 - Dimension 3
Then it is possible to create an analysis with Fact 1, Fact 2, Dimension 2 and all will work okay, assuming content level is set appropriately.
If you have Fact 1, Fact 2, Dimension 1 then data from Fact 2 will not appear, as it has no valid link to the dimension in question
Ditto Fact 1, Fact 2, Dimension 3 here data from Fact 1 would not appear
In order to be able to fix these there are two options; -
1. If there is a foreign key in Fact 1 that allows a direct join to Dimension 3 then you can conform it (ditto Fact 2 to Dimension 1) (create physical and corresponding business model joins) - then the fact numbers will appear and be entirely valid
2. Set the content level to a total level for the "missing link" dimension in question, this will mean that the fact figures will not vary for the dimension in question - which may suffice for your purposes
If you think you already have scenario 1 or 2 as described above then we need more information to help; - physical sql, view of the physical and business model joins, sight of the content level settings on the LTS
Why doesn't Subject AREA 1 have a presentation table for the Date? Subject Areas are for the presentation of logically related elements ... EVERY subject area should have the date dimension reflected - it's about the most conformed dimension you can have.