Well i tried and works, but it takes several double clicks to start editing, again, sacrifice fast workflow for prettyness.

Update the bug does not happend in Blender 2.67b

After some tests it looks like when i try to open a EMPTY text block, the issue does not happend, only when i trie to open a not-empty text block

This a reduced version, it is only a camera and a cube, in the Game LOgic Layout, when i try to open a text file, the file browser shows, then i select the textfile and prees ACCEPT, blender then take like a minute no responding, then all looks normal, but i can click or select anything,nor the cancel button, only the quit prompt

The nodes are from my default blender star up file, are just composite nodes not used in the project, i gonna unlinked them. By the way, i was trying to reproduce the bug. I exported all the models to collada and then import them in a new blend file, all worked very well but then i tried to open a text file in the text editor (the text file is just a import bge statement. So it looks that the problem occur when i try to work with any text file

Latest file with the problem. The data can be append it to another file, but later the new get corrupted.