No infrared sources?
ARG0001ma1 shows me two radio wave sources, but when I switch to IR there are no sources directly underneath these two sources. Could this be a bug, or a mistake on my part?
This is not a bug; it means the host(s) is so faint and/or distant that the IR survey did not detect them. This is not that unusual but if you see a very bright point source in the radio with no IR beneath it then it is worth tagging it as ifrs as these are more uncommon and may be extremely distant (see http://radiotalk.galaxyzoo.org/#/boards/BRG0000001/discussions/DRG00000mt ).