I never had issues with hidden files. All DCI servers run Linux and are
aware of hidden files. It's just not 'pretty' if they go into a wide
distribution.
If you use a preformatted disc - use Mac OS disc utility to check wether it
is MBR or GUID/GPT formatted.
GUID/GPT can cause REAL issues with some servers - to the point that the
content vanishes from the disc. Make absolutely sure it uses an MBR
partition! If disc utility shows GUID - erase the disc and re-initialise
with the MBR option.
- Carsten