The error message wouldn't say "Hey this is an EDIT ORDERS error" persay

.. it would give you an indication as to where the issue might be coming from. Which is why I questioned you dismissing the error logs as not relevant..
That said.. as you can see this is not an issue cause by Edit Order, but by your Tax Cloud add-on. So you are going to have to troubleshoot what's going on with your Tax Cloud add-on.. You will need to post your issue on the Tax Cloud support thread.. suggest you check your install before posting your question.. are you SURE that there is a file called func.taxcloud.php in your includes/modules/TaxCloud/ folder?? (the SHOP side not the ADMIN side..
Wish I could help, but the issue is NOT with Edit Orders..
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