Hm. I’d look to see whether the folder structure is the same as when your blogs were at the old site … or whatever else might be different.
Could you describe how you migrated the blogs? Have the relative paths remained the same? Have you redefined the paths to your home directory? (some plugins require that) Something in the migration probably has led to inconsistencies, so it’s important that you are descriptive about it.
Moderator
James Huff
(@macmanx)
Volunteer Moderator
Check the process of your move against this guide:
http://codex.wordpress.org/Moving_WordPress