Similar to this thread: http://www.joomlathat.com/support/invoice-manager/issue-with-invoices-not-sending

But when I click the 'Not sent' status envelope or the 'send Quote' button nothing happens. I've also trid this in several browsers just to check but the same innactivity in all so far.

I am also on siteground and I have tested the site with php mailer and SMTP and other components are sending so the site config seems fine.

I've checked the forum for similar threads but not seen a fix for my issue.

Thanks.