I did a bit of fault finding this afternoon and I think I have found the problem. There could be 2 issues with the Notebook software:
A. I think there is an issue with the default setting for the sidebar pen, which can be cleared by selecting the pen through the full screen toolbar.
B. There is a confliction between the two toolbars (sidebar and full screen toolbar) where they seem to operate in different ways and cause various problems!
I have made a video of the original issue and included how I found the problems with the default setting and toolbar conflictions:
Touch Screen Notebook Problem - with Solution - YouTube
So, until SMART sort out the issues, the workaround is to select the pen from the Full Screen toolbar first. Hope this helps others with similar issues ....