Database icons displayed inconsistently

RDM Version: 0.9.0.738
Environment Windows 10 64-bit
Redis Server Version: 3.0.6-1

Steps to reproduce:

1. Connect to a database that has some keys

2. Click a key and then the database again

3. Repeat step 2


Expected result: Same icons displayed every time: filter, reload, add key, live update, flush

Actual Result: Live update & flush icons occasionally not visible
