First part of tracks get skipped

[Cebolla]

Also, the OP didn't mention what was being used as the UPnP renderer/player/streamer (ie, the Melco itself or something else) nor what UPnP control point was being used.

VLC & foobar2000 are normally used as audio file players with no UPnP/DLNA involvement, so (without any further info as to how they were set up with respect to UPnP/DLNA streaming, if anything), comparing their playback to a UPnP/DLNA audio file streaming setup (such as one using MinimServer as the UPnP media server) isn't likely to mean or reveal anything.