Photoshop CS6: pen only drawing straight lines?
I am using Windows 8.1
I've seen this question posted on here before (Why can I only paint straight lines in Photoshop CS6?) but my situation and tablet are a bit different. I have recently bought this tablet from amazon and for a few weeks I have been practicing working with it on Paint tool SAI. It works beautifully on the program and I have had no problems with it.
However, whenever I try to use the tablet with photoshop, it only makes straight lines. I know it is not a problem with the Shift key being stuck because, strangely, while I was attempting to draw for a screen capture of the problem, it randomly starting working for a few strokes, as seen in the first screen shot. After that had happened, I opened a new canvas to work on and it unfortunately went back to drawing lines from then on.
Here are the screenshots, trying different brushes (first 4) and having the control on Pen Pressure:


