After Upgrade to VM3.02 can't checkout

[tanolalano]

After I have upgrade from VM 2.6.14 to VM 3.0.2 and It's impossible goes throughout the steps for the checkout.
On cart when click on "Buy now" the page reload on cart. Even if there is a logged shopper.
I try, as well, with the default templates and beeze.
Thank you for support

arancebio.it
J! 2.5.28
VM 3.0.2
PHP 5.3.29

[GJC Web Design]

could be a jquery problem - check your firebug console

or if your template over rides aren't VM3 compatible

have you tried with beez template?

[tanolalano]

The template is compatible with VM3.0.2 the template developer as check, and no matter.
I've checked with beeze too.
In firebug only a loginradius component alert.

[jenkinhill]

Seemed to work OK for me.  Firefox34

[GJC Web Design]

I get a JS error
http://arancebio.it/modules/mod_jvbingtranslator/assets/js/default.js

TypeError: $ is not a function

probably enough to kill the add to cart popup

try disabling that mod

perhaps replace $'s with jQuery will be enough to fix it if it's a jquery script

loginradius is just logging output

[tanolalano]

@jenkinhill
Can't checkout with mozilla

@GJC Web Design
I try disable jvbingtranslator module and plugin, no solve.
I  goes back to backup (VM 2.6.14). I'm waiting for a solution or an update.

I try a fresh J!2.5.28 an VM 3.0.2 with my compatible template and all goes well.
Maybe a DB error or something else in the update process.

Thank You

[tanolalano]

I found this
[Wed Dec 24 09:04:39.953977 2014] [fcgid:warn] [pid 36556:tid 140523899537152] [client 81.XX.XXX.XXX:50784] mod_fcgid: stderr: PHP Fatal error: Cannot redeclare class JModel in /home/umq0mq0u/domains/arancebio.it/public_html/libraries/joomla/application/component/model.php on line 508

Maybe the problem?

[tanolalano]

If I enabled OPC the cart works well. 
any Thought?