crash when clicking on Custom Animation - Add Effect button

[piripiri]

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: Intel

my powerpoint (version 12.1.5) crashes every time I try to add an animation effect to a slide title. More precisely, this is what I do:

1) select the slide title text
2) click on the Custom Animation icon on the toolbox
3) click on any of the Add Effect button

Powerpoint crashes no matter which of the 3 buttons I click.

I'm attaching the crash report. Any suggestion is very welcome!

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Microsoft Error Reporting log version: 2.0

Error Signature:
Exception: EXC_BAD_ACCESS
Date/Time: 2009-03-02 16:00:21 +0100
Application Name: Microsoft PowerPoint
Application Bundle ID: com.microsoft.Powerpoint
Application Signature: PPT3
Application Version: 12.1.5.081119
Crashed Module Name: CoreFoundation
Crashed Module Version: unknown
Crashed Module Offset: 0x00075584
Blame Module Name: CoreFoundation
Blame Module Version: unknown
Blame Module Offset: 0x00075584
Application LCID: 1033
Extra app info: Reg=en Loc=0x0409

Thread 0 crashed:

# 1 0x94986584 in .objc_class_name___NSCFSet + 0x9483B644 (CoreFoundation + 0x00075584)
# 2 0x1d25bcfe in _isFileOrFolder + 0x00000086 (deskUNPDFContextMenu + 0x00000cfe)
# 3 0x1d25bd20 in _examineContext + 0x00000016 (deskUNPDFContextMenu + 0x00000d20)
# 4 0x93fa48e3 in .objc_class_name_IPMDFontRange + 0x93C79CA3 (HIToolbox + 0x000cd8e3)
# 5 0x93fa488d in .objc_class_name_IPMDFontRange + 0x93C79C4D (HIToolbox + 0x000cd88d)
# 6 0x940398ee in .objc_class_name_IPMDFontRange + 0x93D0ECAE (HIToolbox + 0x001628ee)
# 7 0x94039309 in .objc_class_name_IPMDFontRange + 0x93D0E6C9 (HIToolbox + 0x00162309)
# 8 0x0115ee65 in _McpVSSetButtonAlt + 0x00000C25 (MicrosoftComponentPlugin + 0x00146e65)
# 9 0x0116147a in _McpVSSetButtonAlt + 0x0000323A (MicrosoftComponentPlugin + 0x0014947a)
# 10 0x010bc765 in MHIView::HandleEvent(OpaqueEventHandlerCallRef*, MEvent&) + 0x00000541 (MicrosoftComponentPlugin + 0x000a4765)
# 11 0x01161425 in _McpVSSetButtonAlt + 0x000031E5 (MicrosoftComponentPlugin + 0x00149425)
# 12 0x010bb734 in MHIView::GetMHIView(OpaqueControlRef*) + 0x000000F0 (MicrosoftComponentPlugin + 0x000a3734)
# 13 0x010b3560 in MEventHandler::FRemoveHandler(unsigned long, unsigned long) + 0x000001DE (MicrosoftComponentPlugin + 0x0009b560)
# 14 0x93edf143 in .objc_class_name_IPMDFontRange + 0x93BB4503 (HIToolbox + 0x00008143)
# 15 0x93ede57d in .objc_class_name_IPMDFontRange + 0x93BB393D (HIToolbox + 0x0000757d)
# 16 0x93efaed2 in .objc_class_name_IPMDFontRange + 0x93BD0292 (HIToolbox + 0x00023ed2)
# 17 0x93fa872f in .objc_class_name_IPMDFontRange + 0x93C7DAEF (HIToolbox + 0x000d172f)
# 18 0x93fa8591 in .objc_class_name_IPMDFontRange + 0x93C7D951 (HIToolbox + 0x000d1591)
# 19 0x93fa7f21 in .objc_class_name_IPMDFontRange + 0x93C7D2E1 (HIToolbox + 0x000d0f21)
# 20 0x93fa7d13 in .objc_class_name_IPMDFontRange + 0x93C7D0D3 (HIToolbox + 0x000d0d13)
# 21 0x93f6370a in .objc_class_name_IPMDFontRange + 0x93C38ACA (HIToolbox + 0x0008c70a)
# 22 0x93edf143 in .objc_class_name_IPMDFontRange + 0x93BB4503 (HIToolbox + 0x00008143)
# 23 0x93ede57d in .objc_class_name_IPMDFontRange + 0x93BB393D (HIToolbox + 0x0000757d)
# 24 0x93efaed2 in .objc_class_name_IPMDFontRange + 0x93BD0292 (HIToolbox + 0x00023ed2)
# 25 0x93f0d0a8 in .objc_class_name_IPMDFontRange + 0x93BE2468 (HIToolbox + 0x000360a8)
# 26 0x93edf4fc in .objc_class_name_IPMDFontRange + 0x93BB48BC (HIToolbox + 0x000084fc)
# 27 0x93ede57d in .objc_class_name_IPMDFontRange + 0x93BB393D (HIToolbox + 0x0000757d)
# 28 0x93efaed2 in .objc_class_name_IPMDFontRange + 0x93BD0292 (HIToolbox + 0x00023ed2)
# 29 0x01104a71 in _McpFDispatchEventRef + 0x00000073 (MicrosoftComponentPlugin + 0x000eca71)
# 30 0x01105001 in _McpRunApplicationEventLoop + 0x0000051B (MicrosoftComponentPlugin + 0x000ed001)
# 31 0x00024156 in __mh_execute_header + 0x00023156 (Microsoft PowerPoint + 0x00023156)
# 32 0x00003cdd in __mh_execute_header + 0x00002CDD (Microsoft PowerPoint + 0x00002cdd)
# 33 0x0000