export to pdf hangs after upgrade to 7.0.1

[Deleted user]

I performed an upgrade of a 6.15.1 instance of confluence to 7.0.1.  All seems to be working fine.  Every single page I try to export to PDF just hangs.   No progress indicator or any other indication of anything going on except for the browser stating "waiting for...".  This goes on for 300 seconds, untill the nginx server that fronts confluence times out and throws an error.

Log available here:  https://pastebin.com/dfMMp6e0

I've been trying everything but I still cannot figure this out.

We have also seen:

==> atlassian-confluence.log <==
2019-10-03 00:42:34,749 WARN [http-nio-8090-exec-89] [confluence.util.profiling.DefaultActivityMonitor] close Exceeded the threshold of 60000 ms: ActivitySnapshot{startTime=1570063226512, threadId=770, threadName='http-nio-8090-exec-89', userId='admin', type='web-request', summary='/spaces/flyingpdf/pdfpageexport.action?pageId=1474577'}
-- url: /spaces/flyingpdf/pdfpageexport.action | traceId: f141c58e303fedbe | userName: admin | referer: https://wiki.reykjavikdc.is/pages/viewpage.action?pageId=1474577

[Shannon S]

Hello Richard,

Welcome to Atlassian Community. It's nice to meet you!

Your logs are just showing me that Confluence timed out when trying to export the PDF, but it doesn't give me an idea of why that's happening.

Could you tell me, do you have any customizations on your PDF exports, or any add-ons that would be doing that? If you do, you can see the workaround on the following page to reset them to the default: Exporting page or space to PDF fails and causes high load or OutOfMemory Error.

Regards,

Shannon