close program cubase 6.5

when I doing some work on cu6 sometimes getting massage for closing program software is totally hang

Problem Event Name:APPCRASH
Application Name: Cubase6.exe
Application Version: 6.5.0.102
Application Timestamp: 4f2313f6
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 00000000
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 16393
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789