Spent ages trying to Fill and Sign a document, then encountered an "The document could not be saved. Bad parameter." error. Trashed all my effort, because I now can't save, or export, or even push it to the cloud. All methods of saving, exporting, optimising, saving as images, etc., fail. I've wasted my time.

Also, all thumbnails show up as white, as does the entire page if you scroll towards the top. Scroll down, and the pages look as normal... but the file won't save, under any circumstances. Terrible user experience, unprofessional, etc.

Happened just by taking this file and filling in the form fields, plus signing.