Chiming in here as well - same error with two home offices and the sum of the RE taxes entered exceeding 40K.
By playing around with the numbers, I found that the 8829 errors went away if I sufficiently reduced the second home office entry for RE tax. I didn't realize until reading this thread that the magic number I found was the one that made the total exactly 40K.
Hoping the development team fixes this one soon ...
