Suddenly tonight none of my feeds are listed. The area where they would normally appear is a blank grey rectangle. This is on my Nexus 7; things still work properly on my Nexus 5. Help?

app version: 4.2.3
android version: 5.1
device: asus Nexus 7 (flo)
username: isomeme
memory: normal
speed: 0 in 0 and 0
premium: unknown
prefetch: no
keepread: no