I recently upgraded to Eclipse 3.2.2. I am also using MyEclipse 5.1.1GA. I have one project I’m working on that requires Java 1.4.2, and I noticed that, ever since I upgraded, I get consistent “Invalid Stack Frame” messages in the Variables pane whenever I am in a debug session. I thought this might be a problem with Eclipse itself, but I uninstalled MyEclipse and ran Eclipse without it, and the problem disappears. Something in MyEclipse 5.1.1 is messing with the stack frame and preventing me from viewing variables as I step through virtually any section of code.