I have some objects with randomly generated attributes that I am cloning. However, when I use "this" to refer to the object in the Description ("A {this.flavor} popsicle.}") and Drop (RemoveObject(this)) sections of the parent object's interface, the client declares that "this" is an unknown variable or object.

Is there a way to work around this?

As far as the "Drop" script goes, that looks like it should work fine. Can you show some more code from that example (or share a link to a game that demonstrates the problem) so that we can try to work out the problem?

It's a little different for using this within text. Within the text processor ({this.flavor} and similar), this refers to the object in the variable game.text_processor_this. For some reason this isn't set if you have a text description. So you would either need to modify the lookat command from the core library:

  <command name="lookat" template="lookat">
    <![CDATA[
    if (GetBoolean(object, "hidechildren")) {
      object.hidechildren = false
    }

    if (TypeOf(object, "look") = "script") {
      if (not HasAttribute(object,"timesexamined")){
        object.timesexamined = 0
      }
      do (object, "look")
      object.timesexamined = object.timesexamined + 1
    }
    else {
      lookdesc = ""
      if (HasString(object, "look")) {
        game.text_processor_this = object
        lookdesc = object.look
      }

      if (LengthOf(lookdesc) = 0) {
        lookdesc = Template("DefaultObjectDescription")
      }

      if (GetBoolean(object, "switchedon")) {
        if (HasString(object, "switchedondesc")) {
          lookdesc = lookdesc + " " + object.switchedondesc
        }
      }
      else {
        if (HasString(object, "switchedoffdesc")) {
          lookdesc = lookdesc + " " + object.switchedoffdesc
        }
      }

      isDark = CheckDarkness()
      if (isDark and not GetBoolean(object, "lightsource")) {
        lookdesc = DynamicTemplate("LookAtDarkness", object)
      }
      else {
        if (not HasAttribute(object,"timesexamined")){
          object.timesexamined = 0
        }
        object.timesexamined = object.timesexamined + 1
      }
      msg (lookdesc)
    }

    ListObjectContents (object)
    ]]>
  </command>

Or you could make the object's description a script:

  msg ("A " + this.flavor + " popsicle.")

Or you could process those attributes when you create the clone:

  newpopsicle = CloneObject(popsicle)
  // whatever code you're doing to determine the random attributes
  game.text_processor_this = newpopsicle
  newpopsicle.look = ProcessText (newpopsicle.look)

In the Inventory tab under Drop, I have "Run script" selected and then there is the following code:

msg ("You drop the popsicle and it immediately melts.")
RemoveObject (this)

When I drop the popsicle, I get this error:

Error running script: Error compiling expression 'this': Unknown object or variable 'this'

Using your second solution for this.flavor worked though, but only after I restarted the program. Not sure why that was but that part is fine now.

When I drop the popsicle, I get this error:

That's really strange; I can't work it out. Does it print the message first?
There must be something else affecting it. Can you share the game so I can try it out?

Edit: Created a new game with just a popsicle, which gets cloned a few times by the start script. Gave it the drop script exactly as you said, and it works as expected. So I have to assume there's something different elsewhere that's affecting it; but I wouldn't know where to look except for combing through the whole code.

I tried reinstalling Quest and it suddenly works. That was silly but thanks!