Plugin doesn't activate properly. Exits with "The plugin does not have a valid header." but header looks OK
After the error message plugin does display settings screen. API keys can entered, but DropBox refuses connection.
Hosting server does comply with installation requirements PHP 5.2 and cURL
Tested on different and finally fresh WP installation. All give same error
I do have many different WP installations on the same hosting service, with many different plugins, all work fine. Never encountered this activation error issue before.
Please let me know if I can assist in debugging.