When you run any application in Administrative mode (Admin mode) this elevates system permissions for the application. Confusingly, when you run an an app in Admin mode, this can cause problems with file and registry access on Windows.
This is likely because FL Studio is running in a different System Account to your normal Account, and so access to your regular file locations and the Windows registry is restricted. Windows prevents Accounts on the same computer editing data that belongs to the other Accounts.
Symptoms may include, failure to drag and drop from the Browser to the Playlist.
To stop FL Studio from running in admin mode, please complete the following steps:
Image-Line Support Team