Multiple Content-Elements with Assets-elements breaking on what seems to be a specific number of images

Question

Background
So i keep getting an error when adding more images to the second Content-Elements field on one of my pages.

I have one for the maincontent and this one seems to work with an "infinite" amount of images. The second one, who is also parsed last gives me this error:

Error

Unable to load the requested class: assets_lib

The first field currently has 3 Assets-elements with at total of 28 images.

When i try to add more than 4 images to the same kind of Element in the second field i get the error above?

I am not sure where to go next, is there a way to get more info out of EE's error manager. A file and row # would be a nice start. :P

Is this a problem with Content-Elements or with Assets?

Is there anything i can add to help out?

Versions
- EE: 2.8.1
- Assets: 2.3.1
- Content-Elements: 1.6.9 - Stash: 2.5.1

Template code
I keep the Elements-part in a Stash embed, the part that handles assets is:

{assets}

<div class="row-fluid">
  {files}
  <div class="span3">
    <a href="{url}" class="gallery" rel="{element_name}_{element_id}">
      <img src="{url:150x150}" alt="{alt_text}" title="{title}">
  </a>
</div>
{switch="|||</div><br /><div class='row-fluid'>"}

{/files}
</div>
<br>
{/assets}

the part of the page template that embeds them looks like this:

{exp:stash:content parse="inwards"}

<div class="row-fluid">
  <div class="span7">

    <h1>{title}</h1>
    {page-content}
    {stash:embed:components:content_elements_parser process="start"}
    {/page-content}

  </div>
  <div class="span4 offset1 subtopmargin">

    {page-content-2}
    {stash:embed:components:content_elements_parser process="start"}
    {/page-content-2}

    {page-modules-right}
    ...
    {/page-modules-right}
  </div>

  {stash:embed:components:social_share}
</div>
</div>

{if page-modules-bottom}
<div class="row-fluid content">
  <div class="span12">
    ...
  </div>
  {/if}
  {/exp:stash:content}

Answer 1

Open up ft.assets.php file (located at third_party/assets/ft.assets.php), find the method "replace_element_tag" and add this as the first line in that method:

$this->EE->load->add_package_path(PATH_THIRD.'assets/');

Sometimes EE would lose that package path and I'm not entirely sure why.