We are currently using the Autodesk forge viewer to display both 2D and 3D files.
We have recently had a few issues around the 2D/PDF functionality that was working prior to the latest updates.
Currently we are using viewer version 3.1.3 and any new PDF files uploaded when we attempt to open the PDF in the viewer throws a "404 Not Found" error. We have multi page PDF files uploaded prior to the updates last year that can still be opened and pages navigated successfully as expected.
When updating the viewer version to 3.3 the first page of the PDF's will load. There appears to be an issue with new uploads no longer being supported by 3.1.3.
When using version 3.3 we can no longer open other pages in the PDF viewer as there are errors thrown from within the method
viewerApp.selectItem(viewables[id].data, onItemLoadSuccess, onItemLoadFail);
on page change.