Hello Rajil,
I can verify the crash also in LyXWin 1.3.3. You should fill out a bug report under
http://bugzilla.lyx.org
8. Press Shift and Right arrow key 4 times to reach the last element of the first row.
When you don't press Shift, you won't get the crash. The Shift highlights the matrix entries. Normally if you highlight characters and press a character key, the highlighted characters are replaced by the new character. The problem is, that LyX don't know where to insert the new character in the matrix.
But of course LyX shouldn't crash.
regards Uwe
