Strong light reflection.
The interactive software
(purchased and installed separately
by user) may not be compatible
with the system.
Poor USB connection.
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Troubleshooting
Re-direct the lights or move the display to another location
to avoid unwanted reflections from light sources.
• Try with a different version of interactive software.
• Try with the basic drawing program pre-installed on your
computer. (e.g. Microsoft Paint in Windows).
Check if the USB cable has been connected properly, or
try with another USB cable.