Crashing Books & Find/Change

[Hales-Crotchett, Nicole]

Sorry for the potential duplication; first one didn't post. 



Frame 7.1, Win XP Pro
 
Has anyone run into the issue of a book occasionally crashing after running a find/change?  Occasionally after completing I'll get a message telling me that "FrameMaker has detected a serious problem and must quit", and then a message that reads "The instruction at '0x00341469' referenced memory at '0x00000000'. The memory could not be 'read'." Clicking 'ok" closes it all out.
 
The FrameLog has a whole lot of information in it I don't understand; nothing clearly pointing to a cause. I've run into this a few times; generally I'll just re-start Frame and get back to what I was doing.   
 
Any hints?
Nicole