Version 1.4.1 of plugin does not load — PHP Fatal error, msg from logs included

I installed 1.4.1 onto a WP 3.5.1 site and it doesn’t complete loading. The following error is logged for PHP:

Fatal error: main(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "PMA_Config" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in C:\dev\cover\html\wp-content\plugins\portable-phpmyadmin\pma\libraries\common.lib.php on line 2852

Call Stack
#	Time	Memory	Function	Location
1	0.0012	136944	{main}( )	..\index.php:0
2	1.3798	2510840	require_once( 'C:\dev\cover\html\wp-content\plugins\portable-phpmyadmin\pma\libraries\common.lib.php' )	..\index.php:21

http://wordpress.org/extend/plugins/portable-phpmyadmin/