It's crashed when I was about to start debugging and I clicked the call stack button to get rid of that view. It happened twice today that way. It's often crashed while I was using auto comment to document my methods. At some point it just locks up, and I can't select anything. Just a few examples..
If you're using JDK 1.4.1, there is a known bug in it and the debugger in Sun ONE Studio/Netbeans. The IDE hangs as a result of this bug. This affects all kinds of debugging, J2EE, J2SE and J2ME. This is being resolved. In the meantime, you can use the following workaround:
Install the previous version of the JDK, 1.4.0 and modify the ide.cfg in the %forte root%/bin directory to point to the older JDK.
You can also check out the Knowledge Base entry where this issue is addressed at http://forte.sun.com/cgi-bin/WebX?14@@.ee825d6