Hi Conn,
Do you have CLI access to your site? There are two CLI scripts here that you can put in your site root directory and use to see if your site is having problems as it reports on all the plugins. For simplicity and ease of typing the name I named mine p1.php and p2.php. In a terminal window, navigate to your mooderootdirectory, then enter, php p1.php, or enter, php p2.php, to execute the scripts.
The first script can check for meta data on a single plugin, or all of them, depending on what you do, or not do, in line 4. If it encounters errors, it will print them out in the terminal window.
The second script, by default, exports all the data for admin, user 2. The data winds up in .../yourmodledatafolder/temp/privacy/longunreadlefoldername/then a bunch of folders logically organized.
The second script; can easily be altered in line 7, to export the data for any user, by changing the userid from 2, to any other user id, such as the one that you still show as "processing." Maybe the two of them will help you pinpoint what is giving you problems.