Did you check the log file(s), usually located in [user]\AppData\Sony?
They might give you some more explanations about the reason of the crash.
Also, quite a generic suggestion: did you check that your hard disk is not full?
Hope this helps,
Frédéric
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Under- or over-exposed clips? try out FBmn Exposure
Looking for a white balance plug-in? Visit http://www.fbmn-software.com.
Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
https://library.creativecow.net/baumann_frederic/Sony-Vegas_event-pan-crop-tool/1
Or about Keyframes? https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.php
French version: https://geo.creativecow.net/fr/a/12999