[quote name='Streetwind']Welome to the forums!
Do you run the ScienceAlert mod? It may cause you to be unable to transmit stuff right now, it is a known issue. Also compare: [URL]http://forum.kerbalspaceprogram.com/threads/140007[/URL][/QUOTE]
No mods. The funny thing is that after I went to Kerbal for a while and did some other missions, and then went back to my lab, transmission worked perfectly. It's strange because I didn't do anything at all. It just complained about not having any comm device, and suddenly it worked. Oh well. Can't really complain now that it works ;)