Hi Martin
I found the problem: We've modified lx_fs to check that symlinks stay within the core root directory. This conflicted with the vfs_cbe runscript's symlink to the disk image.
A colleague of mine just gave me a hint: Are you aware that the CBE is currently only meant for x86_64? It's not that the code has explicit architecture-specific parts but we have never tested it on ARM for instance and I wouldn't be surprised if there hide some subtle issues.
Thanks for this important hint.
May I ask on which architecture are you running?
I tested on x86_64 but we'll be using CBE eventually on ARM.
Best regards Stefan