I just installed the portable version 9.0.6, and found that I can’t access online help. I see the table of contents, but each page’s contents displays as “Navigation to the webpage was canceled”. I get the same symptoms when I try to bring it up directly by double-clicking on mui/1033/emeditor.chm.
But note that I can view that .chm file from Firefox’s “View CHM” plug in. I didn’t have this problem with 9.0.1 (while running as fixed, installed version).
This is a common problem with Windows Help. In Windows Explorer, right-click on emeditor.chm (located in mui1033 folder), select Properties, and in the General tab, click “Unblock” button. Select OK. Then, you can view the Help.