Is there an error message when you edit your invoice? Can you edit other invoices or other transactions?
We can do some steps to check if this is caused by a full cache.
Please log in to QuickBooks open a private window and edit your invoice. If you can edit it, you can go back to your regular browser and clear the cache. If not, please try other browsers to check if this only happens to the one you use or not.
Please let me know how it goes.
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