Villager trade screen flashes on and off in a fraction of a second, after the latest update - so cant trade with villagers.

Put the summary of the bug you're having here

What I expected to happen was...:
Normal trade screen should come up when trading with villagers.  Also existing wolves wont come out of a sitting pose - not sure if the 2 things are related.

What actually happened was...:
trade screen flashes on and off again in less than half a second - and hence you cant trade with a villager

Steps to Reproduce:
1. Right click on any villager, and the problem will be obvious
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