When my app enters the Versions Browser, I get a stream of warnings logged like 
this:

Nov 18 13:12:28 Grahams-iMac.local xxxxx[23685] <Error>: CGContextClipToRects: 
invalid context 0x0. This is a serious error. This application, or a library it 
uses, is using an invalid context  and is thereby contributing to an overall 
degradation of system stability and reliability. This notice is a courtesy: 
please fix this problem. It will become a fatal error in an upcoming update.

This wasn't happening on 10.9, but is on 10.10. The function name varies, it's 
not always CGContextClipToRects, but many different CGxxx functions.

I have a breakpoint set on _NSWarnForDrawingImageWithNoCurrentContext, but it's 
not triggered for these. Is there another breakpoint I can set? The error 
message doesn't mention one, rather unhelpfully.

--Graham



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