Unhappy Intermittent Hangouts Keyboard Problem

I'm having an issue with opening hangouts and the keyboard not inputting anything into the message field. The keyboards responds to keys pressed but nothing shows up.

I have to close Hangouts from Recent Apps and reopen it to get the keyboard to work. Happens quite often but not everytime.

Problem is on a Nexus 5 with 4.4.2. This is my second Nexus 5 so I'm thinking it's a bug in the software but haven't found anyone else with the issue.

Any ideas?

Thanks