On rare occasions NB thumbnail looks like this:
app version: 4.6.1
android version: 5.0.2 (LRX22G release-keys)
device: HTC HTC One_M8 dual sim (MSM8974)
sqlite version: 3.8.6
memory: normal
speed: 17 feeds in conn:594 read:7 parse:24 store:152
premium: no
prefetch: no
keepread: no