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Hey David! Currently one known issue that would prevent reports form generation would be a result of the size of the report. This will not generate if any modules that contain many rows of data is added. This will include large keyword lists, crawl URL issues, and links data. We recommend downloading CSVs to obtain that data as the URLs will be complete as reports are basically a screenshot so URLs can be cut off. Summaries of the data are best to use in reports. We are moving to a new PDF generation service that will support large reports which will hopefully be ready within the next few months. Let me know if this helps!