While it is not Cool VL Viewer specific, it will affect users of this viewer:
After removing the classic clouds support from their viewer, LL is now going to remove them from their server, meaning even the residents using viewers that are able to render them will soon not see them any more !
The Cool VL Viewer (in which you can even adjust the altitude of the classic clouds: something that would be easy to implement in other viewers as well) and Singularity for the actively maintained viewers, plus all “deprecated” viewers, at least up to v2.7 *cannot* render them in RC Magnum already.
I filed a bug report (
https://jira.secondlife.com/browse/BUG-1456) but Maestro Linden closed it as “expected behavior”. I’d suggest that anyone interested in classic clouds (which I find way prettier and realistic than Windlight clouds) also file BUG reports on the JIRA to let LL know that we still want classic clouds in our SL experience !
See also the
related topic on SL's forum (you could petition there too, I suppose).