Security Certificate Problem

[oldrock]

I'm not sure if this is a 1.1 beta issue or a general VirtueMart question. 

Q. Does VirtueMart require a security certificate for payment processing, even if all I'm doing is redirecting to PayPal to handle everything?

Issues:

1. When I set the SecureURL to https://[www.mydomain.com]/ and click on Checkout in the front end, I get one of two error messages at http:[baseurl]/index.php?page=shop.cart&option=com_virtuemart&Itemid=62:

a. " The security certificate presented by this website was issued for a different website's address"  or
b. "Internet Explorer cannot display the webpage"

2. When I leave SecureURL blank, I get mutiple errors:

YOUR CART

Warning: stristr() [function.stristr]: Empty delimiter. in [baseurl]/administrator/components/com_virtuemart/classes/ps_session.php on line 557

Warning: stristr() [function.stristr]: Empty delimiter. in [baseurl]/administrator/components/com_virtuemart/classes/ps_session.php on line 557

LATEST PRODUCTS

Warning: stristr() [function.stristr]: Empty delimiter. in [baseurl]/administrator/components/com_virtuemart/classes/ps_session.php

I'm running:
- VirtueMart Jan27 nightly build
- Joomla 1.5 Stable
- msql Ver 12.22 Distrib 4.0.16
- PHP 4.4.1
- FreeBSD 4.11 stable

[igbassociatesinc]

Does anyone know how to fix this issue?