Appeon Debugger requires to use Microsoft script debugger.

If Microsoft script debugger is not correctly installed and registered on the same machine or the script debugging is disabled in Internet Explorer, Microsoft script debugger would run into errors, which will prevent Appeon Debugger working properly. You can refer to the Appeon help> Appeon Developer User Guide> Debugging Appeon Web Applications> Important Requirements.

You can also roll back to IE8 from IE9 on W7 by doing the following: 

1.       Open the Programs and Features window: Start > Control Panel > Programs and Features

2.       Then click the “View installed updates” on the left-hand side.

3.       Scroll down to the Microsoft Windows heading and select “Internet Explorer 9”, then click uninstall.

You can also use appeon client Log Feature (provided in Appeon 6.6)