I know I'm 6 years late to this post but I recently opened Rainmeter back up again and had the same issue. This is in case anyone else has the same issue still, I simply deleted the version of Spotify that came with Windows (the Microsoft store version) and redownloaded its desktop version: https://www.spotify.com/de-en/download/windows/ Under the Microsoft download button, hit "Download directly from Spotify" and that'll fix the player issue. Make sure to delete your old Spotify from your programs first.
Statistics: Posted by bak_jein — 49 minutes ago