After running any report in CABI 6.3 JasperReports it will hang with a "Please Wait" message box.
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This problem can be caused by browser addons, such as uBlock Origin, Disconnect, Ghostery and any other app that might "block elements" on a page.
Disable any addons in Chrome or Firefox. Or add your JasperReports server to each respective "whitelist" or "trusted site".
Re-run the report.