Do you have other CS5 betas installed?
Jason San Jose
Software Engineer, Flash Builder
We had a similar problem. From other posts: when FB4 installs it may not update the community help file. The current version is 18.104.22.1680. I downloaded this manually from the Labs page and selected "open" as instructed.
Got help form the Flex Doc Team.
If I open the community help AIR app directly, I have to select Flex from the drop down next to the search field:
But when I now go to help from within FB4 it opens OK (without the warning) directly into the Flex content.
So check the version of community help that you have and possibly upgrade.
We have also identified an issue with Windows 7 64-bit in which a configuration file is installed in an incorrect location. If you are using this configuration, copy the folder:
C:\Program Files(x86)\Common Files\Adobe\HelpCfg
C:\Program Files\Common Files\Adobe
Then restart Community Help.
then go to Edit > Preferences > Local Content and click Update for each of the Help packages.
Flex Doc Manager