For the last 4-5 days I've been having issues with downloading stuff from KC server - map list, maps, scoreboard. It seems like a connection problem, but just in case it's not, I'm uploading log here.
You're connecting to Steam just fine, which mean online isn't a problem.
I see some exceptions about retrieving an exchange file.
System.IndexOutOfRangeException: Array index is out of range.
at MissionHeapPanel+<RetrieveMetadataCo>c__Iterator1C.MoveNext () [0x00000] in <filename unknown>:0
Try renaming the Exchange folder in Documents -> My Games -> particlefleet
If you could also zip up your faulty exchange folder and email it to me (or email a link if it is large) that might help me reproduce this problem and see what went wrong.