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EDIT: (Just noticed your issue was fixed. Yey!)
I'm glad everything is working. The permissions should have been taken care of during the initial MODX install, but sometimes depending on your host -- you may have to manually adjust them. I hope you don't need to go through this again. On the flip side, at least now you know where to look next time.
Cheers
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Permissions 755 or 777 are good enough.
As for the MIGX install steps,
15. Click the new MIGX Action item you created.
After you've refreshed the manager, go to the top navigation menu > Components > MIGX
This will open the MIGX Management section
16. Click the Setup / Upgrade tab
There should be three tabs here: Package Manager, MIGX and Setup/Upgrade.
Select the Setup/Upgrade tab.
'Before this next step, you probably want to ensure that you've created a snapshot of your database.'
The Setup/Upgrade tab also contains its own tabs: Setup, Upgrade MIGX.
Select the Setup tab and click on the "setup" button beneath it.
This should take care of successfully completing your MIGX install.
How are your editors behaving once you've done all of the above? Are you still getting any blank screens?
If yes, try completely uninstalling and reinstalling them one by one.
Also make sure that there's an editor selected in the 'which_editor' system setting.
Just go to: System > System Settings and search for 'which_editor'
[ed. note: treigh last edited this post 11 years ago.]