sbook - 8:06 am on Sep 19, 2012 (gmt 0)

Could this be connected with pre-panda update, algo change, which was on 14th?

Index page have rotating products. Subpages have less information and are rarely updated.
Maybe it would be better to stop the rotation of index, add new products every day and more information near to it. It would be content rich in this case.
With subdomains we can do is only turn on the rotation with products with more information. Impossible to add new products everyday.

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The leader website index came back, but not the subs. Visitors came back, except the subdomain country related ones.

The second leader index is still down, but Germany subdomain is up, and its visitors are almost at the same level.

Other 10 smaller website index pages are still down. Visitors come only from product pages.
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I am not sure if this is content issue or domain/keyword/backlinks related problem.