CustomPress: Post Results in 404 Error

Hi. I'm trying to set up a database of colleges with various types of information available to browse and filter on, using CustomPress. My setup can be seen in these screenshots:

Post Types
Taxonomies
Custom Fields
A Custom Field Example

I have created a template in the themes folder called single-college.php with this code:

<?php the_content(); ?>
<?php echo do_shortcode('[custom_fields_block]'); ?>
<?php wp_link_pages('before=<div class="pagination2">&after=</div>'); ?>
</div><!--.format_text entry-content-->
<?php if (get_option('rpxl_postend_adcode') != '') { ?>
<?php
$endtime = get_option('rpxl_postend_adcode_time');
if (strcmp( date("Y-m-d", strtotime( "-$endtime day")), get_the_time("Y-m-d") ) >= 0) { ?>
<div class="bottomad">
<?php echo(stripslashes (get_option('rpxl_postend_adcode')));?>
<?php } ?>
<?php } ?>

If necessary, I can send the actual template file in case that helps place the code above in context.

When I enter a new custom item, it seems to work well, but when I try to visit the page on the front end, I get a 404 error. Here's an example of the link that is shown ("View Post" in the control panel) after a custom item is published.

Any ideas on what I'm doing wrong?

Thanks in advance!

Frank