I had a similar problem. Updating a font (clicking the 'Update' button on the text format tab) always causes a crash, so I restored the standard fonts.
This made no difference.
Here's the crash report. It says: "likely a collection has been corrupted". Any ideas how to fix this?
cheers
Jay
Process: Pages [7103]
Path: /Applications/Pages.app/Contents/MacOS/Pages
Identifier: com.apple.iWork.Pages
Version: 5.2 (1860)
Build Info: Pages-1860000000000000~1
App Item ID: 409201541
App External ID: 501232653
Code Type: X86-64 (Native)
Parent Process: launchd [456]
Responsible: Pages [7103]
User ID: 501
Date/Time: 2014-05-28 14:05:57.439 +0400
OS Version: Mac OS X 10.9.3 (13D65)
Report Version: 11
Anonymous UUID: 62E7D744-AB79-CAB6-0862-BF2D7DBA8718
Sleep/Wake UUID: 4E830187-CBA1-4547-9093-CEBC314BB069
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Application Specific Information:
Performing @selector(updateStyleClicked:) from sender TMARoundRectButton 0x60800014a450
*** __CFTypeCollectionRetain() called with NULL; likely a collection has been corrupted ***