hierarchydetective
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A lot of errors when trying refreshing
<Error>: CGContextSaveGState: 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.
I was searching for a call to that or similar, but I think it's part of the viewer.