fileupload is not working for me on 2.1 using 1.5.2 off the site. went to get the one off of GitHUB and it blanks out my php served pages. dashboard continues to work.
BINGO! I tried peregrine solution above to UserList plugin, just removing the "&" in all variable cases and here we go. Page no longer blank. @Peregrine and @vrijvlinder provided the solutions. Thank men!