WowAce

What steps will reproduce the problem?
1. Login since 7.1

What version of the product are you using?
1.5.1

Do you have an error log of what happened?

Date: 2016-10-26 03:24:43
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\Chatter\Modules\Buttons.lua line 99:
   attempt to index global 'FriendsMicroButton' (a nil value)
Debug:
   Chatter\Modules\Buttons.lua:99:
      Chatter\Modules\Buttons.lua:96
   (tail call): ?
   [C]: ?
   [string "safecall Dispatcher[1]"]:9:
      [string "safecall Dispatcher[1]"]:5
   (tail call): ?
   ...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:558:
      ...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:551
   (tail call): ?
   Chatter\Chatter.lua:249:
      Chatter\Chatter.lua:242
   (tail call): ?
   [C]: ?
   [string "safecall Dispatcher[1]"]:9:
      [string "safecall Dispatcher[1]"]:5
   (tail call): ?
   ...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:558: EnableAddon()
   ...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:651:
      ...ce\AddOns\Chatter\Libs\AceAddon-3.0\AceAddon-3.0.lua:636
   [C]: LoadAddOn()
   ..\FrameXML\UIParent.lua:407: UIParentLoadAddOn()
   ..\FrameXML\UIParent.lua:498: TimeManager_LoadUI()
   ..\FrameXML\UIParent.lua:1010:
      ..\FrameXML\UIParent.lua:907

Please provide any additional information below.

I think it's because they've added the Quick Join button for Bnet friends, that's just instinct though as I'm no expert.

The FriendsMicroButton was renamed to QuickJoinToastButton which causes the error you reported. Also, frame:GetCurrentScroll() was replaced with frame.scrollOffset so scrolling down is currently broken.