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You have a sample project attached to play with. Tested with NB 6.7 RC3. Run the attached application, and see the normal output. Then break the execution on one of the lines containing the expression paramsCount - (subtract--) and play with quick evaluation. Select the expression: paramsCount - (subtract--) Go over, and out of the selection a few times, so the expression gets evaluated every time. You'll end up with a surprise value written out to the console.
Created attachment 83727 [details] a sample application
This issue is also there with the Evaluate expression (Ctrl+F9).
Evaluation behaves like execution. FYI: I've tested now that evaluation of expressions in Eclipse behaves in the same way.
This bug was reported by NetCAT 6.7 participant.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.