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PDF files turning black

Kolumbo wrote on 2016-10-03:
We files that just appear as black. This problem appeared September 15 and continued through September 23. When we open a pdf, we see a flash of the file that should be there and then the pages go black. We were using the free version of PDFcrowd when this happened. Do you have an explanation on why this happened? and How do we fix the problem. We really need the information in those files. Thanks in advance for insights and help.