Question: sketch questions in Maple TA

I have learned in Brownstone site how to create,
using latex, sketch questions for Maple TA.
I could create a question bank, formed by sketch mode questions,
and then uploaded it to Maple TA, but the applets just don't work.
There are no java error messages.
On the java console i get messages like:

Could not add node because of conflicting x-coordinate:
node with matching x-value already present in system
Please select another point.
Is this a problem of incompatible versions?
Is there a way out?

I'm using
Maple T.A. 2.51
JRE Version: 1.5.0 (build 1.5.0_06-b05)
OS: Windows XP
Browsers: IE, Mozilla
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