actually not... but you may have to plan a security service with your own host, as you have inquiries about hackers attacking your site.
vBulletin itself is not a problem relatively to hackers... they will try to break your site IF they think you are a good target for them... no matter the software you use.
the 3.7.0 b2 is not on the market anymore, as the beta 3 is released... you can't download the beta 2 anymore...
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