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The debugger works fine in Netbeans 6.1 but it crashes with the latest Netbeans I downloaded from trunk. I can send reports or screencasts to illustrate. See also http://statistics.netbeans.org/analytics/detail.do?id=136735
Thanks for the report. Does this happen to you all the time, i.e. is it always reproducible with some steps? If so, would it possible for you to write those steps here?
I just download the latest version and it works perfectly with ruby-debug 0.4.0