When drawing labels in a window (pretty basic), I get the following errors:

Fri Oct 22 21:18:24 MacBook.local TestApp[460] <Error>: CGContextConcatCTM: invalid context 0x0
Fri Oct 22 21:18:24 MacBook.local TestApp[460] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
Fri Oct 22 21:18:24 MacBook.local TestApp[460] <Error>: CGContextDrawImage: invalid context 0x0
Fri Oct 22 21:18:24 MacBook.local TestApp[460] <Error>: CGBitmapContextCreateImage: invalid context 0x0

Most of the time these errors can be ignored, but some time they seem to result in the application crashing or the labels not being drawn.

I was curious how I can go about troubleshooting this. The offending code seems to be this (the 2nd label causes the messages):

            var gaugeBackground = Titanium.UI.createImageView({
                image:'gauge-na.png',
                top:90,
                left:10,
                height:12,
                align:'left',
                width:100
            });
            Titanium.UI.currentWindow.add(gaugeBackground);

            var labelGauge = Titanium.UI.createLabel({
                align:'left',
                width:itemValue,
                height:12,
                left:10,
                top:90,
                borderWidth:1,
                borderColor:'gray',
                backgroundImage:'gauge-value.png'
            });

            Titanium.UI.currentWindow.add(labelGauge);

This draws a label on top of a previously created label (to simulate a partially filled horizontal gauge).

As I mentioned earlier, sometimes running this code results in the application freezing, though it works most of the time. There definitely seems to be something odd going on.

Thanks for any suggestions.