Workbench 5.2.39 Crashes On Start (no replies)

I uninstalled a working version of 5.2.? (don't remember which one now) and installed 5.2.39. Before I installed it i downloaded and installed both of the prerequisits (visual C++ x86 redist and .Net 4.0 client).

When I run it I get

Event Type: Error
Event Source: .NET Runtime
Event Category: None
Event ID: 1026
Date: 2012-04-19
Time: 13:23:56
User: N/A
Computer: REDACTED
Description:
Application: MySQLWorkbench.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
Stack:
at <Module>.base.Logger.log(LogLevel, SByte*, SByte*, ...)
at MySQL.Workbench.Logger.LogInfo(System.String, System.String)
at MySQL.GUI.Workbench.Program.PrintInitialLogInfo()
at MySQL.GUI.Workbench.Program.Main(System.String[])

The program has been successfuly writing the wb.log during startup, so accessing that file isn't it. Here's the wb.log...

13:31:50 [INF][ Workbench]: Starting up Workbench
13:31:50 [INF][ Workbench]: Current environment:
Command line: "C:\Program Files\MySQL\MySQL Workbench 5.2 CE\MySQLWorkbench.exe"
CurrentDirectory: C:\Program Files\Mozilla Firefox
HasShutdownStarted: False
OSVersion: Microsoft Windows NT 5.1.2600 Service Pack 3
SystemDirectory: C:\WINDOWS\system32
TickCount: 160363015
UserInteractive: True
Version: 4.0.30319.261
WorkingSet: 27574272

Anyone have any bright ideas?

Thanks!