1. Please turn on Italian flag on your forum (I didn't find it) - right now users who changed language are not able to turn back to original language. As I wrote content of threads which I was able to see before I saw that I have to register was only one sentence in all cases. This it not what personally I assume as average length of content. Once again this makes pages looks very similar since the difference between short threads is only one sentence - the rest is layout which is same. I do not know how you are so sure that it has nothing to do with this case. If you know something what we do not please just share it so we will be able to help you faster. Do you know why this email was sent?

2. I do not knot what is school program for children in your country, but I hope that it will be very useful for them to know that please register mod after 3 visits has nothing to do with the bots as they go through.
Please focus on the issue. And give required answer - I didn't know which mod are you using and I didn't even ask because it is not important for me - important was is it boot safe. If you are 100% sure that it is safe then great. Just in case you had any doubts you can see how Google sees your forum in Webmaster Tools.

Please note that Google boots are not attacking any sites - Google do not harm sites. We advice to use cache for longer allowed period, because it is better for performance. Also if you feel that it for sure the only reason is number of translation on your page - feel free to disable some of those and enable it again one by one from time to time. Still please consider that your license is active for 6 months and you got this email now. It is hard to believe that for 6 months Google didn't saw those links - in fact many of those you have already indexed. So I'm not sure that this is the cause of email which you got. Even if it is please consider all information which was given to you after analyze of those links.

I do not know what you mean by effective threads.

Also please note that we are working on this issue - you got results of our analyze. And please hold with telling what Google considers - because it is you who considers that Google find it not correct. WE have lot of forums which have absolutely no issue with Google and have all languages turned on. And it is not true that content is not physically exists, please do not tell what we can argue because something... The content exists for everyone who visits it and it physically exists in database in original and in cache in translated form. This is not worlds lottery - this is translation it couldn't happen if content didn't exists. And nothing is cheating here - please read Google TOS - this is Google who claims that translation can be cached for max 15 days. It is EVERYTHING OK with Google in case of automatic page translations - it is Google who made this translation

Also no client can tell that any content which is streamed to him is from static file or not. In fact in this days almost nothing is static now. In vBulletin no view hoes from static HTML structure - everything base on data from database (languages, templates, styles). I have no idea what is your knowledge about client server architecture with thin client, but please note that content exists if link responses. Telling that Google feels it cheating because it doesn't exists has nothing to do with reality.

Also please note that You can in every moment use vBET SEO links and have /en/ instead of language= - this configuration is just up to you and vBET supports it without vBSEO.

About note which you gave - as I wrote if you feel you discovered the real reason of your issue then you have solution. Still please consider that this is some generic answer without even checking what happens. I wouldn’t count on it:
1 - you have similar amount of links for half year.
2 - Google mail itself tells:
"Googlebot may unnecessarily be crawling a large number of distinct URLs that point to identical or similar content, or crawling parts of your site that are not intended to be crawled by Googlebot."

So once again please consider our advices and analyze result. If you feel it is only issue of number of translations which you turned on - then you know the solution.

Do you still need our help/advise in this issue?