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					Originally Posted by Yil  options->preferences->connection->ftp->list params for globalsitemgr->site->options->list params for per-site settings
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 options->preferences->connection->ftp->list params for global <- set to "show hidden files (-al)"
sitemgr->site->options->list params for per-site settings <- set to "default". I changed it to global and now it works. 
 
Thanks for your help. 
 
p.s.
the german translation for this option is a bit misleading. in english it is "List Parameters" but in german it says something like "parameters to list..." ("Parameter auflisten...").