Update to http://zmodemz.blogspot.com/2010/03/ubuntu-vnc.html
tightvncserver was crashing on me when doing simple things like opening file manager. I was getting the following error:
Sep 14 00:21:45 servername kernel: [440445.907880] Xtightvnc: segfault at 7fffaf355000 ip 0000000000448a2e sp 00007fffaf352c80 error 6 in Xtightvnc[400000+178000]
Turns out that the instability is just in this version of tightvncserver, should be fixed in 1.3.10. So for the time being, I swapped out tightvncserver for vnc4server. The commands are identical as far as I can tell, so the switch was easy.
Xubuntu 14.04.1 LTS (Trusty Tahr)