In the settings thing there is an option to lock powers in trays, that solves the problem for me (I activate almost all powers with the mouse as well).
/optionset disabledrag 1
Alternately, I have a key that toggles this so that I don't have to worry about accidentally dragging while fighting, yet I can still easily move things around when I get new powers:
/bind KEY optiontoggle disabledrag
Edit:
*waves to Decorum
I started playing STO during its open beta and I've just come back to CoH. I missed it, I must admit.
And I have to admit something else: I use my mouse to click the buttons in the power tray to activate powers. I know, I'm stupid. But I can't help myself.
The problem is that since I've come back to CoH I've had found a huge problem - whenever I click a power button 90% of the time the power doesn't activate - it makes me drag the button with the mouse. I'm not experiencing any lag at all and my graphics card seems to be handling the graphics on Ultra just fine.
I just wish I could use the power buttons again... Anyone have any suggestions? I would really appreciate your help.
Thanks in advance!