Not actually the issue that you are asking about, but I have tried on and off over the years to get the USB attached to a Pi running moOde to appear on a Windows machine but only with sporadic success. They will appear as UPnP devices that I can play to but not as storage on the network. Did you do anything particular to get this to work?
To come back to the original issue, yes I have also encountered albums not being picked up due to special characters - mostly in Scandinavian names from memory. The other thing that has changed in the current version of moOde is the ability to ignore CUE sheets which on the previous version did lead to duplicate listings when the CUE information was different to the tags.