That message isn’t new, and 99% it’s completely unrelated to the problem sarahpassotphotograp is having. Whether you use PG material or not doesn’t affect the ability to start a print. It’s just a coincidence that it’s stuck uploading, possibly due to WiFi, broken cable, etc., any of the usual reasons. The non-PG warning is just a distraction from whatever is really going wrong.
Support shouldn’t refuse to help just because it’s not PG material. But they will surely ask you to test on a piece of Proofgrade, because that eliminates a bunch of variables. If it also fails with Proofgrade, that means it’s definitely not related to the settings. If it works with PG but not with these piece of bamboo, that’s also an important data point that may help identify the cause. Either way, it’s really helpful to do the standard test: run the Gift of Good Measure on a piece of PG draftboard. Then troubleshoot from there.