Googlebot not following the sitemap?

In the Sitemap Downloads Log don´t shows googlebot following the rest of the sitemap, only the sitemap_index.xml.gz...

And I can´t get back all the links indexed in google...since the instalation of vbseo I lost 50% of the visits to my site and the same amount of links in google (from 600.000 to 300.000)....
Maybe am I doing something wrong but I don´t know what to do to revert this situation...

16
15:27
sitemap_index.xml.gz
Googlebot
66.249.65.176
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
17
16:46
sitemap_index.xml.gz
Googlebot
66.249.65.176
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
18
17:10
sitemap_index.xml.gz
Googlebot
66.249.65.176
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
19
17:51
sitemap_index.xml.gz
Googlebot
66.249.66.232
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
20
19:33
sitemap_index.xml.gz
Googlebot
66.249.65.176
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
21
20:36
sitemap_index.xml.gz
Googlebot
66.249.65.176
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
22
2005-11-19 04:19
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
23
04:33
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
24
04:51
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
25
05:06
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
26
05:20
sitemap_index.xml.gz
Googlebot
66.249.66.244
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
27
05:44
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
31
12:57
sitemap_index.xml.gz
Googlebot
66.249.66.244
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
32
13:20
sitemap_index.xml.gz
Googlebot
66.249.66.65
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
33
13:46
sitemap_index.xml.gz
Googlebot
66.249.66.65
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
34
15:11
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
36
16:03
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
37
16:18
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
38
16:34
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
39
17:19
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
40
2005-11-22 01:54
sitemap_index.xml.gz
Googlebot
66.249.65.234
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Tnx, I'll try that.

Is working now!