I have Spotify Premium, and for the past week or so, Spotify will immediately force close upon opening the app. My main use for Spotify is for my phone, so I haven't been able to listen to any of my music. I've tried this toubleshoot for android with no luck: http://community.spotify.com/t5/Help-Android/Android-Troubleshooting-Spotify/td-p/113082
I have a Galaxy S4, by the way. I have tried uninstalling and reinstalling the app, clearing app data and cache, rebooting the phone, etc. When I tried to delete com.spotify from my external sd card from my phone, I wasn't able to, as it is no longer possible to write files from sd card with the new kitkat update. I even tried deleting it from the sd card via my windows computer, but it is write protected, likely do to the kitkat update disabling management for sd card files.
One other thing: I'm not sure if this could have anything to do with my issue, but I have recently purchased a new (larger capacity) micro SD card for my phone, which I've transferred all of my files from my old SD card onto. I feel like if switching SD cards was an issue though, the issue would be solved after I cleared the app data and cache and the uninstalled/reinstalled.