PaulJ sends word:

The original version of An Iteration of Hell (hal9000_ta.bsp) included in
TA_Mappak1 contained a pair of clipping errors. These have been repaired and the map file has been updated to hal9000_b_ta.bsp. The config scripts to run the maps have been updated to run the revised map and a revised html document has also be included. Both files also contain a text readme file with installation instructions.

Doh, another buggy id release. You can grab the revised full version or the single changed map from AusGamers Files now.