I did loose guide data as well and as a result, some recordings were missed.
[2009/10/25 11:47:29] Guide Update started.
[2009/10/25 11:47:34] Guide Updater Service: Initializing for incremental update...
[2009/10/25 11:47:34] Guide Updater Service: Downloading incremental data from SnapStream.Net...
[2009/10/25 11:47:48] Guide Updater Service: Download complete. Decompressing data...
[2009/10/25 11:47:58] Guide Updater Service: Setting base channel lineups...
[2009/10/25 11:48:02] Guide Updater Service: Processing data complete. Loading incremental data...
[2009/10/25 11:50:05] Guide Updater Service: Data load into database tables failed.
[2009/10/25 11:50:05] Guide Updater Service: If you see repeated data update failures, please visit SnapStream support at:
http://www.snapstream.com/Support/Support.asp
A full update seems to have fixed the guide data missing, we'll see if I get another chance to record the shows that were missed.