Renaming files in thunar sometimes causes it to crash. The files are renamed successfully, but all instances of thunar are closed. I was not able to reproduce the scenario.
There is another user who filed a bug report (downstream, Fedora). https://bugzilla.redhat.com/show_bug.cgi?id=1278743 There are traces attached in the downstream bug report for this issue (which I hope will be useful). Personally, I was able to reproduce this crash. It's not easy though. I basically tried renaming folder 20 or 25 times before I saw Thunar crash. Whether I can reproduce this again is highly doubtful ... :(
Here's the dmesg I receive when thunar crashes: thunar[9089]: segfault at 0 ip 00007feeffc3547a sp 00007ffe0f67b138 error 4 in libc-2.19.so[7feeffba5000+19f000]
Likely a duplicate. *** This bug has been marked as a duplicate of bug 12264 ***