Dear jpmesa,
Please change this code:
<group class="span4" data-normal="span3" data-tablet="span3" data-stablet="span4">left</group>

<group
class="span7d2"
data-normal="span9"
data-tablet="span12"
data-stablet="span8"

noright-class="span9d6"
noright-data-normal="span9"
noright-data-tablet="span12"
noright-data-stablet="span8">main</group>

EDIT TO=>

<group class="span4" data-normal="span3" data-tablet="span5" data-stablet="span4">left</group>

<group
class="span7d2"
data-normal="span7"
data-tablet="span12"
data-stablet="span8"

noright-class="span9d6"
noright-data-normal="span7"
noright-data-tablet="span12"
noright-data-stablet="span8">main</group>

Thanks.

Thanks a lot, you have been very kind and helpful.
This is embarrasing to me. I don't know if there's something else wrong but I copied the code that you send me and when I look the tablet view, the problem is still there.

Dear jpmesa,
Please try to replace by this code:
<group class="span4" data-normal="span5" data-tablet="span5" data-stablet="span4">left</group>

<group
class="span7d2"
data-normal="span7"
data-tablet="span12"
data-stablet="span8"

noright-class="span7d6"
noright-data-normal="span7"
noright-data-tablet="span12"
noright-data-stablet="span8">main</group>

If it still can not fix, please submit ticket and send us your information, we will fix for you.

Thanks.

Thanks a lot. Now its working ok.

Regards