I've been having this problem for a while:
Often (but not always), when I connect APM Planner to the APM board via a USB cable and click on "Terminal" to check logs or whatever, when I press enter three times to get into CLI mode, it causes APM Planner to freeze, and the only way to exit the program is with task manager. Sometimes it happens the first time I press enter, sometimes it happens the second or third time. Sometimes it doesn't happen at all.
I have Windows 7 Ultimate, using APM Planner 1.1.92 and 1.1.94 (but it happened with earlier versions too). I have four APM2 boards, with different versions of Arduplane loaded (2.33, 2.34, and 2.40), and all of them give me this problem as well.
Has anyone else experienced this, or found a solution?