Hi, I’m writing a small widget application rendering a couple of NSView subclasses which update periodically. The widgets are subclasses of [1] and added as subviews to my main view, but the more I add the more likely are some random errors thrown on initialization. The errors include a variety of failed assertions and seg faults (see [2] for examples) and don’t yield any helpful clues. I’m guessing that I’m dealing with something not thread-safe here. Am I doing something wrong here? I’m doing all the drawing inside the drawRect(rect) method (or synchronously called methods) which I don’t call manually. “update” pulls data from various resources, but doesn’t draw. [1] WidgetView class: http://pastie.textmate.org/private/hwfozrwudk2lcwzker20q [2] Different Errors: http://pastie.textmate.org/private/vbp7iuw11ig26zxegzg Jan