Either I am clueless (or very tired) or StringTools:-Remove is not behaving as it should (document attached)

IsThisABug.mw

Working with a Document, I have a procedure which plots a graph and part of the procedure code looks like this:

with(plots)
A := Array(1)
A := plot(...plots two series...):
display(A)

The first time the procedure is called everything is as expected.  The second time the procedure is called (with different values to be plotted), the graph is not updated and therefore does not reflect the changed data

I am thinking that maybe, each time I call the procedure, I need to somehow "reset" or "release" something at the beginning of the procedure so that the plot is recreated? 

I was working on a document to which I had made some changes which had not been saved.  When running Evaluate Worksheet I had to end the task because I couldn't stop the evaluation.  On re-opening the document my changes were lost, not surprisingly.

Does Maple keep any temporary files anywhere from which I might be able to salvage my changes?

Trying to use the following question dialog

with(Maplets[Elements]);
maplet := Maplet(QuestionDialog("Is x > 0?"));
result := parse(Maplets[Display](maplet));

Displays question with Yes and No buttons but whichever button is clicked the result is always false.  This was based closely on an example from the documentation.

So, how can I tell which button was clicked.  Also, the close button could have been clicked - how should that be dealt with?

I am trying to use procedures for the first time in a Document.  I copied and pasted an example (addList) from the documentation into my document.  This example works fine but putting a restart at the beginning of the Document breaks it and I don't understand why.

I am also trying to write my own very first procedure, more or less following the pattern of the example, but that is giving an unable to parse error and, again, I don't understand why.

I am sure this is a very simple error on my part but I would appreciate some help un understanding what I am doing wrong.

Thank you.

ProcsTests.mw