I have noticed one of my notes does not sync with Evernote and Dropbox. Further investigation showed that the note cannot be exported to PDF either. I do not receive any errors, but rather it takes forever and the export does not occur in the end. Exporting it page by page to PNG worked, though. This is weird and unfortunate.
If this is not on the list of the current bugs, I guess it should be.
Plus, since there is no way to copy or duplicate notebooks/pages/notes, I am not able to try solutions like making new notebooks and moving my notes.