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In working with the ttk.Combobox (Windows XP, Python 3.1), I have found that setting the values for the popdown using ttk.Combobox['values'] has an problem converting the string to the proper Tcl value when (and this is the only instance I have found) there is a backslash in the string but no spaces. In this case, the string will translate if it is enclosed in curly brackets '{'+mystring+'}', which I believe is the Tcl syntax to not make substitutions.
I have attached a short script that illustrates this issue.
Clayton

With 3.2, (Winxp) I get combobox with first line,
input as
r'C:\Python31\Lib\tkinter\test\test_ttk',
displayed as
"C:Python31Lib	kinter	est	est_ttk"
Something either deleted \ or converted \t to tab.
Indeed, adding a space to the end of the string or enclosing as you specify inhibits deletion/conversion, so this seems like an error.
With imports fixed
from Tkinter import *
import ttk
the file runs fine in 2.7, so this seems 3.x specific problem.

This is a simple work around. 
def fix_tcl_error(s):
 if '\\' in s and not ' ' in s:
 s = '{'+s+'}'
 return s
You can get the text from the Combobox with no issues. The error is in posting it to the Combobox when you have backslashes and no spaces (I think). I have just been running everything through this def before adding it. It has worked with no problems so far using Windows paths and grep-type search strings.
CD

Does the attached patch work for you ?

I also ran into this issue in python 3.3 64bit on windows 7. I was adding paths into a combo box and was escaping all \'s myself. When I created a folder with a space I noticed the paths with the space had double the \'s I wanted.
I removed my escaping and tested the patch and the attached image shows that it works. The top of the image was before, the bottom of the image was after.

I should also add that I yellow highlighed where the space is in the image I attached so it easier to see.

On a side note:
If you pass raw string literals into the combo box as values this issue doesn't happen.

Issue15861 has a more general patch which fixes also this issue.

Fixed in issue15861. Thank you for report, Clayton Darwin.