Band Height Change Results in Nulls

[tommy.curnyn]

Hi all,

Working in iReports 5.6.0. 

1. My report displays some variables returned from my subreports and performs some calculations on page 1 (in Detail 1) and it works fine. 
   
2. I've got quite a few bands and subreports (7 bands and 11 subreports). 
   
3. My issue: when I go to add a new subreport in Detail 7,  the calculations and my variables on page 1 display null. 
   

Any idea what's wrong here? The only thing that's changed is the total band height. My report is an A4 portrait so I believe my total band height should be okay (http://community.jaspersoft.com/wiki/report-structure-jaspersoft-studio). 

As mentioned in the link above, the sum of all band heights (except for the background) has to always be less than or equal to the page height minus the top and bottom margins.

In my case the sum of all band heights (including the Title and Column bands = 588 so I believe I'm well within this constraint.

Any help on this would be REALLY appreciated. This is driving me nuts!

Thanks,

Tommy