[DeusExBestia]

The problem is with the plugin itself, when it is trying to use a login. Without an account set up in the Account Manager for Twitter jDownloader works just fine and downloads everything on the <user>/media page as requested.

However, when you try to user jDownloader to download a protected/locked account, it rightfully errors and says "This tweet timeline is protected". When you try to turn on your account for twitter in Account Manager, jDownloader won't get anything from twitter at all. Even when the account says "Account is ok: Free Account", neither locked nor unlocked accounts download.