can't render or save?! Help, please!

Hi, I am working on a multi-track montage 88.2 k, 32 bits float:

When I want to render a final file, a message pops up saying that Wawelab can’t recognize this file format (.wav). then crashes…

When I render to a temporary file, I can playback that file, but when I try to save it, the resulting file is an empty 80 kb .wav…

Any help highly appreciated

NB This happened on a windows 7 pc for both 32 and 64 bits versions and on a macbook pro…

What output file format do you choose, exactly?

Everything unchanged, but the problem persists also with other formats I tried so far.

If you have more than 2 channels, you must specify the channel output. Dont use “unchanged”