I have seen so many comments and references like this one, so I went and read the whole investigation report.

1. There was a spacecraft (MCO) and a module that was sending some data from the Earth.

2. The module was delivered late when MCO was on its way for 4 (!) months already before that staff manually calculated the needed data.

3. Some teams switched into "defensive mode" not willing to communicate and fixing the problem when it was clear.