Verification builds:
1.1.0.4 Retail

Summary:
When you try to trade with a villager for the first time, the window appears for a split second then closes.

Steps to Reproduce:

1. Spawn a villager
2. Open the trade window/GUI

Observed Results:
Notice that it closes, if it is the first time opening it.

Expected Results:
The trade window should stay open.

Screenshots/Videos attached: Yes

Notes:
This will also happen if you haven't interacted with a villager for some time.
Presumably this is linked with the game loading in the villagers profession and trades.