Hi Panos
Regenerate All is a one off function - why would your client need it? Once the meta-data is generated you should then disable that part of the plugin.
Unfortunately, to assess if the keywords are empty or not involves loading that information from the database. So, because you have 10000 articles, it can't handle that level of data in one go.
Try adjusting the number of articles loaded each cycle again before you try the unpublish trick. That latest version I posted had been set at 500 again which does appear to be too much for your server. The code should be faster so you may get away with just dropping that to 100 or maybe as low as the 81 you found before. Then try uncommenting the set_time_limit section (see addkeywords.php in the latest version I posted above) , then the unpublish trick. Unpublishing is a pain in the arse you see.....
