Not sure what occurred there. May have been a momentary outage on Google's end, or some other issue with Google connecting with your embedded file for conversion. Sounds like it resolved itself.
If you find you have to use the "force" option a lot (some servers don't report certain file attributes normally, making this a requirement on pretty much every file), you can set it globally under Advanced Options > Disable internal error checking. Then force=1 is assumed and you don't need to add it to the shortcode explicitly.
If you need to send me a link privately in the future, my email is near the top of the donate.php file, or use the support link in your plugin list. Thanks.