Missing guide data for ABC Channel 20 Sydney

[edcba]

This has been noticed on Whirlpool, but I thought I should mention here that for ABC Channel 20 in Sydney, a search by channel only shows 'To be advised' in 4-hour increments, whereas for other channels the programs appear correctly. However, search by program name does work for Channel 20, so I can set up recordings, season passes that way. It has been suggested that this issue might be caused by a conflict with old TiVo data, and may rectify itself in a few days, but why would this issue affect only one channel?
In any case I thought I should mention this in he OzTiVo forum.