I have beginning to speek of this problem in this Universal Viewer (ATViewer) - Lister alternative entry.
I had associated UV to lister with F3 in TC but it works only one time each two tries on a text file. I have the same problem if I configure it with ALT-F3 :
1st try on a file, it is OK, I close UV with ESC.
2nd try on the same file, I see no effect, UV is not on my screen

3rd try on the same file, it is OK.
I have made another try with my current free text editor PSPad and I have the same problem. At second call the application seems to be not called and then not visible on my screen.
I have made the try with the external lister from Christian Ghisler and it seems the problem does not occurs then.

I have reproduced the problem with TC 6.56 and 7.0beta3

Best regards
