I don’t get any error but when you read sac files into a stream they are then in a (apparently) random order. Obviously they can then be sorted into the order required. It’s not a major problem but the behaviour is different and an extra line required in code.
I’m not an expert in file systems but from what I understand, under the new file system filenames are returned arranged by the hash of their filenames instead of alphabetically
For further info it might be best to contact George Helffrich (email@example.com) since he fixed the problem for reading files into the sac program.