This realy needs someone to walk through what's happening under nsPrintJob::DoCommonPrint in a debugger. Can you post your new guard code to save that person writing the same thing?
Bug 1659470 Comment 15 Edit History
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This really needs someone to walk through what's happening under nsPrintJob::DoCommonPrint in a debugger. Can you post your new guard code to save that person writing the same thing?