I have a similar problem, with web2py 2.0.6 on Windows 7 32 bit and*Internet Explorer 8 * on the same PC. But after the initial page like the one attached, the editor immediately modify the code on a single line only. If I change the code, save and exit, I can see the problem again on another editing session on the same file. Chrome and FF don't have any problem. Trying to manually upgrade ACE to the 08.30.2012 version from https://github.com/ajaxorg/ace-builds did not resolve the problem.
Anyone else has this problem? Nico --
