Mr. Volz, Dissolve on another data set - I created the test dataset (i.e., ~1,000 sq.ft. two-part polygon) to eliminate our actual datasets as a cause (i.e., file size and complexity, limited 32-bit memory addressing in W7 32-bit, and possible geometry errors). All tests of all datasets work fine on XP and W7 64-bit machines. Where do you store the data – I have tested all combinations of local (e.g., C:\) vs. network (i.e., UNC and network drive paths) vs. server (SDE master in Oracle as administrator). Again, all work on XP and W7 64-bit.
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