The spectator replay mode has always worked on the PBE, but the recent League patch has caused it to stop working completely now. Annoying, nice tool to have. I have tried everything for 3 days with no luck. We just gotta wait until Haxalot gives us an update. It is still running from a Oct 31, 2012 patch.
The bad thing I see is LoLRecorder is so out of date, when the next few PBE patches hit Live servers it will most likely be unable to work with spectator replay mode. This means a lot of the youtube channels that do montages, skin reviews/previews, top play lists and even the pro broadcast scene will more than likely be screwed. Not to mention your average user who likes to analyze the details of a game which the regular, non-spectator mode cannot deliver.
With nearly 600,000 forum and site accounts, they sure know how to neglect their community by not giving any text updates on the progress or future patches, turning the forums basically OFF since early January. Good job.
I am actually surprised you managed to make a thread on their forums Ice, it shows 1 post from the 20th, then 1 from the 7... maybe my stuffs bugged.