Hello Gerard,

i think you refer to the screen below, where you can only publish modules or exclude from mobile with Yes/No switcher



I can't find a direct relation with this screen of Responsivizer and the table #__assets used by Joomla core for ACL... it's a table not used directly by Responsivizer.

It's involved by joomla itself when publishing/unpublishing modules, but the SQL message should also appear in the same way when you edit modules using standard Joomla modules manager. unpublishing modules here is the same operation than using standard Joomla list.
Moreover looking at the SQL message you reported, it seems the error is due to a lack of 'alias' field.
But really no Joomla versions are shipped with the field 'alias' in the assets table.

Best regards

John