[TYPO3-shop] tt_products 2.7.0 not displaying

[sean]

Hi,

I've been around in circles trying to find the problem, but can't see 
why I have no products displaying. I have created one test category and 
one test product, and am just trying to get basic products to display; 
no colours or articles, nothing fancy.

I've tried .. well, lots of stuff.

Hoping that someone can suggest where to continue looking to get this fixed.

Although no products display, the header assigned in the plugin 
'General' tab is shown, and viewing the plugin through the Typoscript 
Object Browser' on the store page I'm seeing what (I think) I ought to see.

Before I write any more I'll paste in an error that I receive when 
accessing the page with the store plugin on it:

  Core: Error handler (FE): PHP Warning: Parameter 2 to 
tx_ttproducts_pi1_base::main() expected to be a reference, value given 
in 
/usr/local/www/TYPO3_4-4.svn/typo3/sysext/cms/tslib/class.tslib_content.php 
line 6731

For my setup I'm using typo3 4.4.6, tt_products 2.7.0

I have a standard page with the plugin added and configured as 
'Products: list', startingpoint points to the sysfolder that contains my 
product and category records. I'm unclear on the 'Required parameters' 
list, so I've tried that with both nothing and with items from the list.

I have the current Table Library (table) and Static Methods for 
Extensions installed.

Using a sample template, products_template.tmpl, and I've included 'Shop 
System Old Style' in the extension template on the store page.

The product's 'In Stock (pcs)' field has a quantity of 10.

Source from store page:
	<!--  CONTENT ELEMENT, uid:2/list [begin] -->

		<div id="c2" class="csc-default" >
		<!--  Header: [begin] -->
			<div class="csc-header csc-header-n2"><h1>store header</h1></div>
		<!--  Header: [end] -->
			
		<!--  Plugin inserted: [begin] -->
			
		<!--  Plugin inserted: [end] -->
			</div>
	<!--  CONTENT ELEMENT, uid:2/list [end] -->

Any thoughts? And if I'm not missing something silly, any clues on 
debugging the problem?

Thanks,

Sean