What steps will reproduce the problem?
1. Install Coconuts
2. Load game
3.

What is the expected output? What do you see instead?
Library errors are occuring. Sometimes, this makes the addon assume you are mounted when you are not, other times, it just locks the addon and you can't do anything until you reload.

What version of the product are you using?
3.0.174 beta

Do you have an error log of what happened?
[2009/09/09 23:04:49-996-x6]: Coconuts-3.0.172\Coconuts.lua:2423 bad argument #1 to 'format' (string expected, got nil)
Coconuts-3.0.172\Coconuts.lua:2423 in function `DetermineMount'
Coconuts-3.0.172\Coconuts.lua:2392 in function `GetPlayersMounts'
Coconuts-3.0.172\Coconuts.lua:2786 in function `HasMountListChanged'
Coconuts-3.0.172\Coconuts.lua:1851 in function `OnUpdate'
LibLordFarlander-UI-2.0-90154:443: in function <...\LibLordFarlander-UI-2.0\LibLordFarlander-UI-2.0.lua:438

Please provide any additional information below.
I'm also getting errors from Bartender 4 and ButtonFacade, as well as frame errors as follows:

2009/09/09 23:04:48-996-x1]: Coconuts-3.0.172\Coconuts.lua:2423 bad argument #1 to 'format' (string expected, got nil)
Coconuts-3.0.172\Coconuts.lua:2423 in function `DetermineMount'
Coconuts-3.0.172\Coconuts.lua:2392 in function `GetPlayersMounts'
Coconuts-3.0.172\Coconuts.lua:1661 in function `OnProfileChanged'
Coconuts-3.0.172\Coconuts.lua:1829 in function <Interface\AddOns\Coconuts\Coconuts.lua:1666
(tail call): ?:
<in C code>: ?
<string>:"safecall Dispatcher[1]":9: in function <[string "safecall Dispatcher[1]"]:5>
(tail call): ?:
AceAddon-3.0-5 (ButtonFacade):531: in function `EnableAddon'
AceAddon-3.0-5 (ButtonFacade):621: in function <...dOns\ButtonFacade\Libs\AceAddon-3.0\AceAddon-3.0.lua:607
<in C code>: in function `LoadAddOn'
Interface\FrameXML\UIParent.lua:229 in function `UIParentLoadAddOn':
Interface\FrameXML\UIParent.lua:252 in function `CombatLog_LoadUI':
Interface\FrameXML\UIParent.lua:499 in function <Interface\FrameXML\UIParent.lua:471