I have the same issue as the original topic, my action stocked in Pending Downloads and look at the log file and found this:
ActionLogMessage: (group:118303,action118304) Action signature verified for Downloads
DownloadsAvailable: checking for 'http://relayname:52311/bfmirror/downloads/118304/0’
DownloadsAvailable: false (action id 118304)
But when I looked at the Parent Relay client log file, it did not received the action ID: 118303.
I looked at again in the relays download file, I found the corresponding sha1 of the fixlet it looks like it was there already, but did not received the action ID:118303 sent by the Bigfix Server.