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Starting with version 8.11, the program was using the eave height of the building as the reference height for h for calculating leeward Ce for for the I-15 method, however, Commentary I- 7 (b) says to use 1/2 the building height. This is a conservative bug effecting taller structures, as the minimum value of 0.7 for rough terrain and 0.9 for open terrain is imposed for shorter structures. The bug affects buildings taller than 12.5 meters for rough terrain and buildings greater than 6 metres for open terrain.
For a 20-meter building, for rough terrain the program was using a .82 Ce when it should be 0.7, for a 17% conservative error, and for open terrain, it is using 1.15 when it should be 1.00, for a 15% error. This has been corrected.