I had posted problems with the arranger and video a long time ago, and also made 2 support requests on this, since the Arranger DEFINITELY has problems.
The post can be found here, just if you think switching to a newer version makes sense in this particular field:
Currently I am using 9.5.50 (coming from 7, switched to 9, now 9.5.50), following the support crew’s initial suggestion to switch over to 9.
The problems have not been solved by now (just tried it again), and I am getting really mad about this issue.
Cheers