I don't know how it happened, but my blog managed to get itself into a state where there are multiple copies of a single post. They all have the same permalink, so I assume it's the same post in the underlying database, but I can't delete them, even if I try to delete all three at the same time. You can see my site here: http://www.kimbly.com/blog/

When I go to the movable type administration front page, I see these warnings at the bottom of the screen:

CODE
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in substr at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) substr outside of string at lib/MT/Serialize.pm line 59.
MT::App::CMS=HASH(0x8351880) Use of uninitialized value in addition (+) at lib/MT/Serialize.pm line 60.


I get the same warnings whenever I rebuild my site or try to delete the redundant items.