Please describe the problem:
I opened GIMP 2.6.4 for the first time on this computer which runs Windows Vista Home Premium SP1.  Once it opened, I clicked "File", then I clicked "New...".  Once the "Create a New Image" dialog box opened up, I clicked on the + next to "Advanced Options" to expand the dialog box options.  The Advanced Options expanded and displayed, but the box did not expand to display the Advanced Options fully.

Steps to reproduce:
Unfortunately, after trying to reproduce this bug, I cannot.  The dialog performs normally whenever I try to get this to reoccur.

1. Open GIMP.
2. Select File > New...
3. Click on "Advanced Options"

Actual results:
The Advanced Options opened as expected, but the "Create a New Image" dialog box did not expand to accommodate the space required to display the options properly.

Expected results:
The "Create a New Image" dialog box should expand to fit all the new contents inside its boundaries.

Does this happen every time?
No, this has only happened once.

Other information: