Can Only Draw Straight Lines?

I'm using a Intuos 3 Wacom Tablet on a 64 bit Windows 7 Home Edition computer. I have installed the latest drivers for it, but I'm finding that at times I will be drawing normally, and suddenly I can only draw straight lines. Usually this happens when I hit Ctrl-Z for undo, it doesn't change when I switch to the mouse.

 

Now, normally by restarting Corel it will draw normally. However, I've done this, and nothing. I've restarted my computer, still nothing. I even calibrated my pen within the program three times and disabled flicks. It works fine in Paint and I've just discovered it works fine when I open a new document and Corel and begin drawing.

 

My work is saved as a CPT, and has two objects.

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  • I have the same problem. Corel Photo-Paint Home & Student Edition X8 and Wacom Intuos Pro M.

    It's not the first time the problem occurs. I'm pretty sure I don't accidentally press anything - the last time it began was when I clicked an on-screen Undo button (a coincidence or the source of the problem?).
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