I don't have this problem. I have some cdimage.mpc+cue albuns and I have no problems burning them to audio cds, using the "Burn Image" function. I also tested dragging some files made with v1.14 to an audio compilation and all went well (it plays them fine but I didn't burned the CD). I have Nero 5.5.10.35.
cya
edit: did you renamed the dll?
QUOTE
The first two letters of the plugin DLL name must be "nx" in lower case, otherwise it will not be loaded by Nero Burning ROM.
Hope this helps :P