I'm having an issue where aggregations give me 0 as a result whenever viewing in web viewer (locally and on my server). Preview works fine, but web viewer always shows 0, even for simple things like row counts in a table. I'm using BIRT 3.7.2 32 bit on Windows 7 64 bit, using JRE7u11 32 bit. I tried different combinations as well, testing the same report on BIRT 4.2.1 64 bit and JRE6u38 64 bit, all giving the same results. I don't see a bug posted for this issue.