I do not know anything about your set up, but kinda sounds like you are using the internal player to store from the acer computer. Maybe the storage on the HC is full. If that is not the case then try to access the music folder, typically C:MUSIC folder, on the network at \\\\hlgateway\\music. You will need to rescan the folder to re populate the updated library.
I am shooting in the dark not knowing any of the programming or system set up