Hi all!
I downloaded the Quest and Squiffy programs earlier this month, and am enjoying learning to use them. But I've run into a problem with Quest freezing when I try to execute a specific custom command. Here's the code for the command:

  <command name="Equipment roll">
    <pattern>Roll for loot!; Roll for loot; Roll to recieve; Roll for equipment;</pattern>
    <unresolved>Eh, what?</unresolved>
    <script><![CDATA[
      if (player.unidentified_treasures > 0) {
        while (player.unidentified_treasures > 0) {
          placeholders.encounter_dr = DiceRoll("1d100")
          if (placeholders.encounter_dr<=10) {
            placeholders.gold = DiceRoll("1d12") * 100
            player.gold = player.gold + placeholders.gold
            msg ("Recieved " + placeholders.gold + " gold!")
          }
          else if (placeholders.encounter_dr<=52) {
            msg ("Not written yet")
          }
          else if (placeholders.encounter_dr<=81) {
            lower_tier_roll
          }
          else {
            upper_tier_roll
          }
        }
      }
      else {
        msg ("You don't have any unidentified treasures!")
      }
    ]]></script>
  </command>

I've double-checked all my spelling, all of the objects and attributes exist, and I've created separate commands to test the low and high-tier loot roll functions, so I'm certain those aren't the problem.
But when I try to run the command in-game, Quest freezes up. I can close the game, but Quest no longer works properly for the rest of the session, and usually prints this error message after a minute or so:

System.ComponentModel.Win32Exception (0x80004005): Not enough quota is available to process this command
at MS.Win32.UnsafeNativeMethods.PostMessage(HandleRef hwnd, WindowMessage msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Interop.HwndTarget.UpdateWindowSettings(Boolean enableRenderTarget, Nullable`1 channelSet)
at System.Windows.Interop.HwndTarget.UpdateWindowPos(IntPtr lParam)
at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Can anyone tell me what's going on?

Your while loop will continue forever. It is set to keep going until player.unidentified_treasures is zero, but at no point in the loop is player.unidentified_treasures altered. Before this line:

   placeholders.encounter_dr = DiceRoll("1d100")

Put:

   player.unidentified_treasures = player.unidentified_treasures - 1

usually quest freezes/crashes is from infinite loops, so it's just a matter of checking your code.

loops need a way to terminate. Either: you got a counter which you raise/lower until a hitting certain value, an array/list reaching its end item / itemCount, or you ensure that the loop will hit/get a set/pre-determined terminating value, and there's probably another method, which I'm going blank with at the moment, lol.

Thank you both! I must have deleted that part when I switched from creating new objects to using predefined ones.