WowAce

With the release of Cataclysm Classic Pre-patch, Bartender is broken. You can pull up the Bartender options but no bars are showing whatsoever. 

Yes, having the same issue. Hope updates soon.

No errors thrown at login, nor when options are opened.  But bars are not visible and the following is thrown when selecting a bar within options:

2x Bartender4/Options/ActionBar.lua:39: Invalid bar id in options table. (1)
[string "=[C]"]: ?
[string "@Bartender4/Options/ActionBar.lua"]:39: in function <Bartender4/Options/ActionBar.lua:37>
[string "@Bartender4/Options/ActionBar.lua"]:52: in function `member'
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:215: in function <...nfig-3.0/AceConfigDialog-3.0/AceConfigDialog-3.0.lua:164>
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:1193: in function <...nfig-3.0/AceConfigDialog-3.0/AceConfigDialog-3.0.lua:1110>
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:1639: in function `FeedGroup'
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:1564: in function <...nfig-3.0/AceConfigDialog-3.0/AceConfigDialog-3.0.lua:1548>
[string "=[C]"]: ?
[string "@Ace3/AceGUI-3.0-41/AceGUI-3.0.lua"]:66: in function <Ace3/AceGUI-3.0/AceGUI-3.0.lua:64>
[string "@Ace3/AceGUI-3.0-41/AceGUI-3.0.lua"]:300: in function `Fire'
[string "@Ace3/AceGUI-3.0-41/widgets/AceGUIContainer-TabGroup.lua"]:342: in function `SelectTab'
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:1675: in function `FeedGroup'
[string "@Ace3/AceConfig-3.0-3/AceConfigDialog-3.0-86/AceConfigDialog-3.0.lua"]:1564: in function <...nfig-3.0/AceConfigDialog-3.0/AceConfigDialog-3.0.lua:1548>
[string "=[C]"]: ?
[string "@Ace3/AceGUI-3.0-41/AceGUI-3.0.lua"]:66: in function <Ace3/AceGUI-3.0/AceGUI-3.0.lua:64>
[string "@Ace3/AceGUI-3.0-41/AceGUI-3.0.lua"]:300: in function `Fire'
[string "@Ace3/AceGUI-3.0-41/widgets/AceGUIContainer-TreeGroup.lua"]:508: in function `SetSelected'
[string "@Ace3/AceGUI-3.0-41/widgets/AceGUIContainer-TreeGroup.lua"]:185: in function <...ce3/AceGUI-3.0/widgets/AceGUIContainer-TreeGroup.lua:181>

Locals:
(*temporary) = nil
(*temporary) = "Invalid bar id in options table. (1)"

Set CurseForge client to install the ALPHA version of the addon and it will work again.