I've tried it with build 3834. EU Buckets can now be opened, but I always get a "Invalid certifiate error für *.s3.amazonaws.com".
There is another strange behaviour. Let's assume the buckets name is "bucket.domain.com". When I open it, I see all the files and folders AND a folder with the same name than the bucket "bucket.domain.com". When I open it, CrushFTP hangs.