No web GUI on upgrade

[dszp]

I upgraded a NanoBSD (NetGate box) from a March 6th snap to the current March 22 (4pm-ish). Three extensions are installed, Blinkled, Widescreen, and OpenVPN Client Export. Upon reboot, no access is available to the WebGUI. I'm also unable to connect to OpenVPN. When I connect via SSH, I get this message:

Using keyboard-interactive authentication.
Password:
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/20060613/mbstring.so' - /usr/local/lib/php/20060613/mbstring.so: Shared object has no run-time symbol table in Unknown on line 0
*** Welcome to pfSense 2.0-RC1-nanobsd (i386) on access ***

  WAN (wan)                 -> vr1        -> x.x.x.x
  LAN (lan)                 -> vr0        -> x.x.x.x
  T1 (opt1)                 -> vr2        -> x.x.x.x

This repeats with error message if I run option 11 to Restart webConfigurator, but it also says "Done." However, the web interface then says 500 Internal Server Error instead of timing out.

[dszp]

Rebooting from the shell seems to have fixed the problem for now. I can't seem to get the RRD Graphs page to load (it seems to hang trying to connect to the page but not actually displaying anything) and that was happening before the upgrade as well. But I can get to the GUI and the PHP error is gone at the shell.