gnome-terminal frequently corrupts its display, replacing a line of text with a bolded '~' character in the leftmost column. This appears to happen at random.
Any instructions on how to reproduce? Please make sure you have the 6.1 errata installed, specifically for gnome-libs and gnome-core.
I have installed the errata since the initial report and the problem still happens. I am not sure how to reproduce it, it appears to happen pretty much at random though any sort of vt100 cursor movement codes will increase the likelihood of it happening.
I have recently upgraded to Nethack 3.3.0 and I finally managed to get it to run in the GNOME terminal. At random, I also see a row of ~ while I play the game in tty mode (I really don't like the X11/tile version). It seem to occur particularly when you move from level to level (ie. going up and down the stairs). At random a row of "."'s (which represent floor) are replace with "~"'s. Also bits of the walls are replaced by letters. It seems to get worse if you repeatedly go up and down the stairs. I have thought that this was a Nethack problem, but the game seems to be OK if I don't use X (& GNOME). However is you save the game and return to it later, the random "~"'s and letters are still there. Hopefully this is of some help. I will look at it again myself. John P.S. I did install the newest version of gnome-core and gnome-lib P.P.S. Nethack options=tty,DECgraphics etc...
I think this is most likely a termcap issue.