I'm running e2 studio version 3.1.0.24. I used to be able to set breakpoints without any problem.
Today, I can't set a breakpoint. I double click on a line and nothing happens.
FYI, when e2 studio is closed, there is a process running e2studio.exe *32.
http://www.eclipse.org/forums/index.php/t/333528/
"Solved by opening debugging configuration and changing process launcher to "Standard create process launcher" after clicking on the button "Select other" at the bottom of the window."
Without wanting to sound like I am teaching you to suck eggs, it might be worth searching google for people who are having problems setting breakpoints in eclipse. Unfortunately, I don't use this IDE (or any, actually - I prefer to code in vim) so I'm afraid I can't offer any more help than that suggestion. Sorry.