ofGLUtils: ofGetGlFormatAndType(): internal format not recognized, returning GL_RGBA

I'm getting countless errors like this and I can't figure out what's causing them...
I'm using v0.8.4 on os x 10.9 (Maverick) and I have a suspicion it's coming from somewhere here:

cam0.setDeviceID(0);
cam0.initGrabber(320,240,false);
    .
    .
    . 
    pixels0.setImageType(OF_IMAGE_COLOR);
    . 
    .
    .
void threadedFunction() {
	while(isThreadRunning()) {
		cam0.update();
		if(cam0.isFrameNew()) {
			lock();
			pixels0 = cam0.getPixelsRef();
			unlock();
		}