Lobby Selector/Inventory Selector no longer works

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I run Minecraft on a Macintosh using Yosemite (10.10.1). My friend told me to press F3 to display coordinates to find him. After doing what my friend said, I can no longer use Lobby Select or access my inventory.
Best Answer
It may just be lag.
My recommendation: relog. If that doesn't work, turn down visual settings, I.E. Change fancy to fast, remove clouds, turn down max frame rate down, etc.
I see no reason why F3 should interfere with commands. If you think it would help, you can always turn the debug screen off by pushing F3 again.
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*SERVERSELECTOR* E *LOBBY* PERFETTA CON *DELUXEHUB*! PARTE 2
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