I've installed the version 1.3.475 on snow leop 10.6.6 (Cubase 5.5.2). I've overwritten files located on /Library/Frameworks/Nebula.framework/Versions/1.0/bin and again I've done this: 4. Copy the "Nebula3 Reverb.dll" file and rename it "Nebula3 CUDA.dll" or choose a name that you like. 5. Copy the "Nebula3 Reverb.xml" and rename it as above (e.g. "Nebula3 CUDA.xml") 6. Load Nebula3 CUDA and go to the MAST page and set the FREQD to mode 15 (CUDA 2ch Mono), then click in SAVE.
Now my cuda works again.
Since my Nebula's library is on external hardrive I had to add "alternativedatapath" again on my xml files.