> However, upon further investiagtion, any query that I run with a

SUM

> (Ex: SELECT A, SUM(B) AS SUM_B FROM C GROUP BY A) causes reports to
> stop displaying all data; the report still runs, the same number of
> pages print, etc (Assuming one record per "A").

Only in design time; at runtime, everything shows up fine.
#^%@ *&^& @!@#...