Textract Analyze Document demo error

I have successfully used the Textract "Analyze Document" demo (https://us-west-2.console.aws.amazon.com/textract) in the past, but all interactions with the demo - be it a document upload, or even resetting the demo - now return a nondescript error: "Textract encountered an error while processing this document."

The documents I've used are all an accepted format (JPEG or PDF) and are well under the 5MB / 11 pg limit. The documents successfully upload and can be previewed in the demo tool, but no results are displayed; I see the error message instead.

Is the Textract demo tool broken? Is there additional account configuration that I need to be aware of?