[TxMt] cursor and display bug

[FasterDogs]

Greetings,  I've encountered a bug recently with textmate after 6  
months of use.  it just popped up so I'm presuming it's related to  
something with the systems font or somesuch.  but no other app has  
this issue.

I use textmate primarily for editing my rails scripts , As I said it  
worked fine, but now my cursor is generally 1 or 2 columns off from  
the insert point.

here's an example

type a number sequence to show
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5  
6 7 8 9 0

then hilite, copy and paste in groups of +5

1 2 3 4 5
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 0 1 2 3 4
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5  
6 7 8 9

same thing without spaces..

12345678901234567890123456789012345678901234567890
12345
1234567890
123456789012345
1234567890123456789
123456789012345678901234

I've tried different fonts but get the same result.  some times in my  
code when there is italics or bold the spacing can be very off like  
by 4 chars or more.

any ideas?
osx 10.4.8, default install

thanks
-zaq