@myung, @a_johnson: I am no PHP guru by all means, but what I suspect is that the plugins call for various core WP engine files that, while being used, can not be overwritten. kind of like trying to delete files in use on your computer. that’s what made me try disabling the plugins.
perhaps one of the WP experts here can explain that for us.
Michael,
try deactivating your plugins first – especially something “unusual” – other than the most common ones. I had the exact problem running the WP e-commerce plugin, the update would stall while it was active.
after deactivating WP e-commerce, the update went through.
regards,
Andy
