wildcard certificate in shared ip

Hi,
I've already tried the common guides but still not able to get my wildcard ssl cert working on a shared ip address.

I have bought a wildcard ssl certificate for *.domain.com
That certificate should work for /http://www.domain.com and shop.domain.com
I installed it with the result of no errors and it seems to be working: see /https://domain.com/test/index.htm

Then,
when I try to go to the main website /https://www.domain.com/ but it loads broken
The same url with standard http loads fine: /http://www.domain.com/

I checked tail -f /usr/local/apache/domlogs/shop.domain.com-ssl_log and it is logging an Err 500 message on every request.

We need to enable ssl for both main website and online shop in the subdomain shop.domain.com

I followed instructions in the following forum thread:

http://forums.cpanel.net/f5/wildcard-ssl-shared-ip-problem-191851.html
and troubleshooting guide:
https://documentation.cpanel.net/display/ALD/SSL+FAQ+and+Troubleshooting#SSLFAQandTroubleshooting-WhatisawildcardSSLcertificate

I am running a Centos 6.6 server with cpanel 11.46 and apache 2.2.27

Strange detail: after installing ssl host in WHM, I shared it, however the column "Needs SNI?" is tagged as "No" for both main website and subdomain. Is not that supposed to be a "Yes" since the certificate was installed in a shared IP?
What am I missing?

Any help will be appreciated.

Best regards,
Paco

 

Update:

I've found out why it is not working on main website. It is old outdated code using absolute paths i.e. http://... so it cannot load properly using https

Problem persists on subdomain shop.domain.com
It is an updated Prestashop, so it should work fine. However, when I try https://shop.domain.com/administrador/ the following error is recorded in shop.domain.com-ssl_log:

Code:

62.175.212.10 - - [21/Jan/2015:18:20:26 +0100] "GET /administrador/ [B][COLOR="#FF0000"]HTTP[/COLOR][/B]/1.1" 500 20 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"

Note that it is trying to GET using HTTP and not HTTPS. Why would it be that?