[Orgmode] Bug in column mode where parent has TODO [#A] [/]

[Luke Crook]

In column mode, if I modify the TODO status of a subtree then 
the priority of the parent becomes manged.

I am using org-version 7.4

For example;

** TODO [#A] [2/3] BLAH
*** TODO BLEE

When in column mode, changing the subheading to something other than 
TODO results in the following:

** TODO [#[2/3]/3] BLAH
*** PENDING Blee

The priority is removed. Adding the priority back, results in this 

** TODO [#A] [#[2/3]/3] BLAH
*** PENDING Blee

And changing the subheading again (when in column mode) to something 
other than TODO results in this;

** TODO [#[2/3]2/3]]/3] BLAH
*** PENDING Blee

-Luke