Recently I had a case where Raspbian’s default file manager(pcmanfm) kept on crashing.
The user would click on the icon, the application would open and then immediately close or crash. If the application was executed from terminal, the same results were met.
I had a look at the logs and noticed that pcmanfm kept on throwing out a “Segmentation fault“
A quick fix for this issue is to reinstall the pcmanfm:
sudo apt-get install --reinstall pcmanfm