That's odd because I've used Picard under Windows 7 to tag over 15,000 MP3 files and never had a problem. I hadn't heard about that issue before, so I don't know if anything was done to address it specifically.
I've never tried it on my Linux system, so I can't help you there. It's been doing a fine job for me under Windows 7. I'm currently using version 1.4.1 of Picard, but I see that it's not the latest. Looks like it's update time.