Unable to mix and master at 96kHz

Thanks a lot for your help Mr. Soundman and Arjan.
I changed the buffer size to 2048 and 4096 and went through some tests, it is slightly better performance wise but as soon as I load any of the Izotope plugins the sound disappears and Wavelab is no longer responding.

I even get the following crash info everytime I load Ozone 8:

In 44kHz and 48kHz project this is never happening and Ozone works like a charm.

I don´t aim for CD but I would like to offer my audio files at the highest possible quality and let my clients choose to download 44kHz, 48kHz or 96kHz.