The project can be downloaded here: http://www.sendspace.com/file/nmd1tv I am working with BTB 0.6.0.7 The project can be opened and exported for RBR without problems. But if the Wall1 is present in the project, RBR crashes while loading the track. The log file (temp subdirectory inside RX_CONTENT directory) shows no error info End part of the log.txt file: (... RXTRACK::LoadEvents ... RXTRACK::LoadSpawn ... RXTRACK::LoadDriveLine ... RXTRACK::ready ... ) If Wall1 is deleted, the track can be played in RBR, so the problem is probably this wall. If a delete nodes from the wall, keeping only the first 256 ones, there is also no problem to play the track, but if I keep the first 512 ones, the problem is there, so may be the problem is a specific node (or nodes) of the wall. I have lost a lot of time searchig for a solution. Any hint will be really appreciated.