I actually have no clue why this happens. I cleared the rpt file as far as I can understand. I cleared the log-file Binpbo creates as far as I can, but the CTD still occurs.
A test mission to reproduce the failure is included in the *.rar
Mod can be found here: https://dl.dropboxusercontent.com/u/84370332/rp_870mcs_a3.pbo
Please keep this mod private, since it is not for open release due to this bug.