Cannot show dock or use hot corners when using CGEvent to move mouse cursor

Question

I have the following code:
NSPoint mouseWarpLocation = NSMakePoint(mouseX, mouseY);
CGEventSourceRef evsrc = CGEventSourceCreate(kCGEventSourceStateCombinedSessionState);
CGEventSourceSetLocalEventsSuppressionInterval(evsrc, 0.0);
CGWarpMouseCursorPosition(mouseWarpLocation);
This code allows me to move the cursor to a new set of coordinates mouseX and mouseY. It works fine and I can move the cursor around, but even if the cursor is moved to where the hidden dock is the dock does not appear. Also even if the cursor is move to one of the corners say (0, 0), the hot corner action I have set is not invoked. I am confused as to why this is so because I thought that things like hot corners use the cursor's position to see if it need to do something. Any advice is appreciated.

Answer 1

The university requires all computers to have anti-virus software and recently switched to Sophos from Symantec, in July I believe. That was a new software install. Since it just works in the background and I never actually access it, I had forgotten about that. I hope that is not the problem, as I am required to have antivirus software.
And no I have not created a new user to log in. It is erratic enough that I don't know how long would have to be on to see if the problem recreated itself. Sometimes it seems like just minutes after I start the computer up and sometimes hours. Right now it is still working since starting this morning.