Adobe Flash Pro CS6 tools can only draw straight lines?

happens when you click shift key only.

 

That's regularly happens when you click shift key with your mouse, so I think that your shift key is squeezed in.. 

Everyone's answer is irrelevent to the question; please read the details.

PS: I solved the problem, so no need to answer anymore.

no of course not, but I think that you're shift key is jammed 

• yes to make straight lines you have to press (shift and drag)

 When you press shift ... that will be happing.... best regards

it happens when your press the shift key so i think your shift key is jammed

no you can draw another type of lines using the the pen tool (p)

He can draw straight, curved, curved and irregular lines

adobe flash is not flexable in design so we can use ai and import object

If you choose the line tool to draw, it will draw straight line. However, to draw curve lines, you can do either of these two ways. 1. After making a straight line, you can take your cursor to anywhere of the line and click and drag to make it curve. 2. Select pencil tool and select smooth type(at the bottom in the tool bar after selecting pencil tool) to draw curve line. Hope this helps you.