Crash after concert pitch entry

Version Pre-release 0.9.5
# 1926
Windows XP

I was working on this short snippet, transposing a flute part for Bb clarinet. I was entering notes in concert pitch. The crash came when I switched back to written pitch.
Whenever I try to re-open the score, program crashes immediately. (Just that obnoxious Microsoft message that program has encountered a problem and needs to close - no hints as to the problem.) Event viewer does not show anything that I can interpret.

I have not been able to reopen this score. (Re-booted PC. Copied the .mscz file to new file name.)

If you have tips or hints on how to avoid future problems, I am interested.
Thanks - Mike

Microsoft Event Viewer log entry below:
Event Type: Error
Event Source: Application Error
Event Category: None
Event ID: 1000
Date: 8/19/2009
Time: 7:50:30 AM
User: N/A
Computer: BLEVINS45216
Description:
Faulting application mscore.exe, version 0.0.0.0, faulting module mscore.exe, version 0.0.0.0, fault address 0x01710e22.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 41 70 70 6c 69 63 61 74 Applicat
0008: 69 6f 6e 20 46 61 69 6c ion Fail
0010: 75 72 65 20 20 6d 73 63 ure msc
0018: 6f 72 65 2e 65 78 65 20 ore.exe
0020: 30 2e 30 2e 30 2e 30 20 0.0.0.0
0028: 69 6e 20 6d 73 63 6f 72 in mscor
0030: 65 2e 65 78 65 20 30 2e e.exe 0.
0038: 30 2e 30 2e 30 20 61 74 0.0.0 at
0040: 20 6f 66 66 73 65 74 20 offset
0048: 30 31 37 31 30 65 32 32 01710e22
0050: 0d 0a ..