> Hmm...works fine here. Circular renames are supported since years. Just retested
> it with a modified puckman set where I exchanged the checksumvalues of 6e with

Yes, it works within one zip file. But not between two separate zip files that have one rom inside each. The following dat files make clrmame go pop:

game (
name "Addams Family, The (U) (Beta)"
description "Addams Family, The (U) (Beta)"
rom ( name "Addams Family, The (U) (Beta).bin" size 1048576 crc 2803a5ca )
)

game (
name "Addams Family, The (UE)"
description "Addams Family, The (UE)"
rom ( name "Addams Family, The (UE).bin" size 1048576 crc 71f58614 )
)


---->


game (
name "Addams Family, The (U) (Beta)"
description "Addams Family, The (U) (Beta)"
rom ( name "Addams Family, The (U) (Beta).bin" size 1048576 crc 71f58614 )
)

game (
name "Addams Family, The (UE)"
description "Addams Family, The (UE)"
rom ( name "Addams Family, The (UE).bin" size 1048576 crc 2803a5ca )
)