Cursor disappearing while editing filename

Hi,
I have a strange problem lately where I go to edit a filename in DT, and the inline cursor disappears. I can still edit the name and move the active location of the cursor with the arrows, but I can’t see where I am in the filename (i.e. no blinking line). I use text file filenames as notes, so I edit them a lot. Have you seen this before or do you know how to fix it?
Thanks

I’ve seen something similar in the past-the cursor did not entirely disappear, but it changed to white so that I could just barely see it blink. It was not uncommon to see this on Mountain Lion, but I’ve never encountered it with Mavericks so I just assumed it was an OS X bug.