PowerPoint 2011 se bloquea al intentar formatear una forma

Cada vez que intento dar formato a una forma (por ejemplo, editar una línea) en PowerPoint se bloquea dejándome este mensaje de error:

Microsoft Error Reporting log version: 2.0

Error Signature:
Exception: EXC_BAD_ACCESS
Date/Time: 2014-02-20 12:15:50 +0000
Application Name: Microsoft PowerPoint
Application Bundle ID: com.microsoft.Powerpoint
Application Signature: PPT3
Application Version: 14.3.9.131030
Crashed Module Name: WLMGraphicsDevice
Crashed Module Version: 14.3.9.131030
Crashed Module Offset: 0x000165cf
Blame Module Name: WLMGraphicsDevice
Blame Module Version: 14.3.9.131030
Blame Module Offset: 0x000165cf
Application LCID: 1045
Extra app info: Reg=en Loc=0x0415
Crashed thread: 0

Funciona en Mavericks en la versión polaca

EDITAR Si sirve de ayuda que lo que he encontrado en el registro del sistema;

Feb 20 14:05:01 MBPTest.local com.apple.IconServicesAgent[316]: main Failed to composit image for binding VariantBinding [0x25d] flags: 0x8 binding: FileInfoBinding [0x353] - extension: ppt, UTI: com.microsoft.powerpoint.ppt, fileType: ????.
Feb 20 14:05:01 MBPTest.local quicklookd[3607]: Warning: Cache image returned by the server has size range covering all valid image sizes. Binding: VariantBinding [0x803] flags: 0x8 binding: FileInfoBinding [0x703] - extension: ppt, UTI: com.microsoft.powerpoint.ppt, fileType: ???? request size:64 scale: 1