How many photos did you try to export?
Are you a 64-Bit system, and how much RAM do you have in your system?
Please post the system information found in the LR help menu.
It was two concurrent exports of 72 photos each.
I have a Windows 7 64-bit system with 32GB of RAM. In LR5.6, I could export 700+ photos concurrently with no issue.
For some reason, the forum gives me an error everytime I attempt to paste in the system info from LR.
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Thanks for sharing the event logs. Looks like some issue with the Camera raw plugin. Re-installing Lightoom should take care of the issue.
Do let me know how it goes.
Thanks, will try running the installation program again and run a "repair" and see what that does.