Hi, I installed W3-total-cache plugin to speed up my WPMU installation, and then I noticed some malfunctions in a couple of plugins:
1. in a plugin where get_blog_details() was used, since it doesn't return the $blog_id properties, but always same properties of the current blog when called sequentially for several $blog_id(s).
2. in another plugin to display site wide comments. This time the malfunctioning function is switch_to_blog, it doesn't switch to the next blog given, always presents the result from the first call.
Inspecting the source I see that both of them do use wp_cache_xxx functions calls inside... maybe could be this causing the problem?
( I obviously turned OFF default wp cache system as stated in w3tc readme.txt by removing any DEFINE in wp-config.php regarding CACHE )