if you have multiple file webparts on the same page, there is a problem with the upload button. normally when you hit that button a section expands, like the export action of a QWP. when you have multiple file webparts on a page, the upload section of all webparts except the first one is blank. perhaps the code is trying to use something like getById() that will break if that's no longer unique?

example here:
https://xnight.primate.wisc.edu:8443/labkey/project/WNPRC/EHR/Logs/begin.view?