Found another possible bug introduced with the SMP 7.1 SP2 Rollup v2 (2/17/12). During report/filter creation, if you add more than one filter condition then save, the filter expression unexpectedly switches to Advanced Mode. I have an open case but tech support has yet to verify my findings.
I posted another issue where the "Add" button doesn't work in advanced mode (a support engineer confirmed this behavior and the issue was sent to the advanced team for review) so if I normally add conditions to the Filter Expressions tab and it switches to advanced mode after saving the filter/report, I can't add additional filter expression operands. With all these bugs/defects, I seem to be going around in circles.