On several of the posts imported with the MT importer, I'm seeing the following in the .markdown file:

---
layout: post
title: Post Title
date: '2006-05-01 22:52:05 -0500'
excerpt: !ruby/string:Sequel::SQL::Blob |-
  PHA+DQpJIHdhcyBub3RpbmcgdG8gYSBmcmllbmQgYSBmZXcgd2Vla3MgYWdv
  IHRoYXQgSSZyc3F1bztsbCBiZSBtYWtpbmcgYW4gYW5ub3VuY2VtZW50IHNo
  b3J0bHkgYWJvdXQgc29tZSBjaGFuZ2VzIGluIGRpcmVjdGlvbiBmb3IgQ29t
  bXVuaXR5IEJhbmR3aWR0aCBhbmQgeW91cnMgdHJ1bHkuIFRoZSBnaXN0IG9m
  IHRoZSBub3RlIHdhcyB0aGF0IEkgaGF2ZSByZW5ld2VkIG15IGNvbW1pdG1l
  bnQgdG8gYmVpbmcgImFncmVzc2l2ZWx5IHNtYWxsIiAodGhhbmtzIHRvIE1h
  cmsgU3VybWFuIGZvciB0aGF0IHBocmFzZSkgYW5kIGZvciBDb21tdW5pdHkg
  QmFuZHdpZHRoIHRoYXQgbWVhbnMgdGhhdCAyMDA2IGlzIGFsbCBhYm91dCBn
  ZXR0aW5nIHNtYWxsZXIuIE9mIGNvdXJzZSwgdGhpcyBmcmllbmQgYXNrZWQs
  ICJHZXR0aW5nIHNtYWxsZXI/IEhvdyBzbz8gVG8gd2hhdCBlbmQ/IiBBbmQg
  dGhpcyBpcyBiYXNpY2FsbHkgd2hhdCBJIHJlc3BvbmRlZDoNCjwvcD4=
mt_id: 1711

---

I'm wondering why it's having trouble with the excerpt? Any pointers appreciated.

Phillip.

jekyll 1.4.2
ruby 2.0.0
mysql 5.5.27
gem mysql-2.9.1
gem sequel-4.5.0