Hey  Wanted to add an example of the kind of problem I'm having. 
When I try loading my frontpage that has a featured contant slider, it uses a Slider module to generate the markup I need to use with the slider. The code works great on my localhost, but when I try it on my live server, I get this error: 
"Call to a member function width() on a non-object (line 53 of /var/www/clients/client220/web338/web/site/modules/Slider.module)" 
 
<?php
class Slider extends ModuleJS { 
        public static function getModuleInfo() {
                return array(
                        'title' => 'Slider',
                        'version' => 100,
                        'summary' => 'Generates Markup for Slider', 
					'autoload' => true,
                        );
        }
function addPaginationLinks($slide_count)
{
	$slide_links = "";
	$count = 1;
	while($count <= $slide_count)
		{
			$slide_links .= "<li><a>$count</a></li>";
			$count++;
		}
	return $slide_links;
}
function renderSlide($slide_page)
{
	if($slide_page->summary) {
		$summary = strip_tags($slide_page->summary); 
		if(strlen($summary) > 400) { 
			$summary = substr($summary, 0, 320); // display no more than specified length
			$summary = substr($summary, 0, strrpos($summary, ". ")+1); // and truncate to last sentence
		} 
		$summary = trim($summary); 
	} 
	if ($slide_page->template == "video")
	{ 
	$img= $slide_page->video_poster->width(300);
	$width = $img->width;
	$height = $img->height;
	$slide ="<div class = 'media slide'> <a href = '$page_address' ><img src = '".$img->url."' class = 'rounded-img img' width = '$width' height = '$height'> </a> <div class = 'bd'> <h1><a href = '$page_address' >".$slide_page->title."</a></h1> <p>".$summary."  <a href = '$page_address' >... <span class = 'strong secondary'> Watch video </span> </a></p> </div></div>";
	}
	else
	{
		$img= $slide_page->images->first()->width(300);
	$width = $img->width;
	$height = $img->height;
		$slide ="<div class = 'media slide'> <a href = '$page_address' ><img src = '".$img->url."' class = 'rounded-img img' width = '$width' height = '$height'></a> <div class = 'bd'> <h1><a href = '$page_address' >".$slide_page->title."</a></h1> <p>".$summary." <a href = '$page_address' >... <span class = 'strong secondary'> Read More </span> </a></p> </div></div>";}
	return $slide;
	}
function render($slide_pages, $p_class)
{
$slides_mu = '<div id="slides" class = "unit size1of1 man"> <div class="slides_container">';
$num_slides = count($slide_pages);
foreach($slide_pages as $slide)
{
$slides_mu .=  $this->renderSlide($slide);
	}	
$slides_mu .= '</div> 
  <div class = "slider_nav">
  <a href="#" class="prev">Prev</a>
  <ul class = "pagination">';
$slides_mu .= $this->addPaginationLinks($num_slides);	
$slides_mu .= '</ul>
			<a href="#" class="next">Next</a>
                </div>'; 
$slides_mu .= '</div>';
	return $slides_mu;		
}
}