Install "Could not cache system settings" = not working

TinyMCE says it installed correctly aside from this message "Could not cache system settings."

However, it's not loading when I edit resources.

I did all these things:

TinyMCE is a large package. Make sure that it's not over your host's upload limit.
Make sure the richtext box is checked on the page settings for the docs you want to use TinyMCE on.
Make sure the files are there in assets/components/tinymce and core/components/tinymce.
Clear the site cache manually by deleting the files in the core/cache directory.
Flush all permissions, then flush all sessions.
Clear your browser cache and cookies.
Log in again.

Uninstall and remove all versions of TinyMCE
Download TinyMCE from http://modxcms.com/extras FTP it to the core/packages directory
In Package Manager, click on "Add Package" and "Search Locally for Packages"
Install TinyMCE.

Still not working.... This is on iPower, if that makes a difference.

Is tinyMCE set in the "Editor to Use - which_editor" in the system settings? Look in the Rich Text Editor section. It should set it upon install, but maybe it didn't?

If tinyMCE isn't in the dropdown list in system settings but it shows as installed, then you've got a problem :~}

Yup, it's selected.

Maybe I'll just have to try another WYSIWYG

That's not usually the answer. Something isn't right, and it's best to figure out what it is because further issues could arise with packages. Do other packages install correctly?

What's in the MODX error log?

Attempting to install package with signature: tinymce-4.3.3-pl
Package found...now preparing to install.
Grabbing package workspace...
Workspace environment initiated, now installing package...
Attempting to set which_editor setting to TinyMCE.
Attempting to set use_editor setting to on.
Attempting to fix forced_root_block setting for TinyMCE.
Could not cache system settings.

Could not cache context settings for mgr.
Could not cache context settings for mgr.

Successfully installed package tinymce-4.3.3-pl

This was a reinstall. The original install didn't have the mgr cache issues, but the cache system error is still there.

Looks like a permission problem with the cache directories.

It does, however everything else I've installed has done fine (Wayfinder, GetResources, SimpleSearch...). Why would TinyMCE be having a problem?

Check the MODX error log, in the Reports menu in the Manger.

[2012-10-15 19:32:05] (ERROR @ /connectors/workspace/packages.php) Error caching lexicon topic lexicon/en/core/workspace
[2012-10-15 23:32:30] (ERROR @ /connectors/system/index.php) Error caching action map mgr/actions
[2012-10-15 23:33:19] (ERROR @ /connectors/resource/index.php) Error caching lexicon topic lexicon/en/core/default

They all seem to be caching errors.

Have you checked the config files? Look about mid document, here for all the files that may need checking:
http://rtfm.modx.com/display/revolution20/Moving+Your+Site+to+a+New+Server

Look in the workspaces table, is the path correct there?

I would re-run setup, with a new zip file at this point though. It often helps. How did the unpacked files get to the server? FTP or via the server (file manager, etc.)?

Check the docs for the upgrade information, that's what you'll be doing.
http://rtfm.modx.com/display/revolution20/Upgrading+MODx