MacManX and esmi have been doing their level best for weeks to deflect all blame to plugins, but only a small percentage of blame lies in that direction.
Actually, quite often it is actually plugins and themes. I have helped 10 people just this week troubleshoot in the WP IRC just by deactivating plugins. It often turned out that it was an old plugin or something along those lines.
If it were not, then there would not be so many forum threads about this same and similar topics.
There are also SO many threads about not being able to log into WordPress. I suppose that's a bug in WordPress to?
Instead of abusing volunteers, how about actually trying to solve the issue. You didn't help the original poster at all with your comment and may have actually confused them.
If its a real bug, submit a ticket to trac. If your just causing trouble go away.