Hello again DrPo
As it is not clear what versions of anything you are using, here is some general advice about Twonky as this is the second time you have posted about this issue and are still having grief...
Twonky has always used folder images and has always had an issue with embedded files of the wrong physical size (not resolution). From your comment on not having the root password I am assuming this is a linux based NAS? This is a case sensitive OS. Folder images are therefore required to be Folder.jpg. Any changes to the structure of files will require a Rebuild of the database to be recognised unless you have access to the OS and can delete the cache, in which case a Rescan would probably suffice.
IF you are using WAV files with Twonky do not use mp3tag unless it now supports LIST tags, not the ID3 tags. Twonky is configured by a web page usually at port 9000 with no need for root access.
IF you have corrupted FLAC files and wish to try some of the above, use dbpoweramp to 'Convert to' then select 'FLAC' in the pop-up utility (even though the source is FLAC) to overwrite the files with a freshly tagged one and see how you get on...
Good Luck
many thanks for your response. You I are right, i have also posted in the past on Twonky. Your remarks are to the point. In fact I have managed during the last few days to finally nail down the twonky set up and am rearly happy it finally works. I do indeed run a Linux based NAS. The crucial step was to be able to access the 9000 port - which I could not. The reason? My NAS had defaulted the "webaccess" in the twonky config file to "no" so I first hand to realize this (useful posts in several places) had to install a shell access program, log on to the NAS, change user to "root", add "write/execute" permissions to the twonky configuration file, change the webaccess parameter and restart so as to be able to access the twonky web interface on http:/NAS-ip:9000.Then what did the trick to fix my album art problems (including finally getting excellent resolution!) was to change the receiver type of both my iPad and NDX to "NAIM streamer" (also "SONGBOOK DS" does the trick). I should write a detailed "how to" about this one day, as all the info can be found in several places but not all of it in one place. From the same page I can now clear the cache, rescan and restart the server which as you say is often necessary.
