I am using SlickEdit Pro 2014 (v19.0.2.5 64-bit), using Brief emulation, and I noticed something strange:
1) Place multiple (3+) cursors in the same screen, in the middle of the line
2) Press the END key
Instead of going to the end of each line, the first cursor goes to the end of the line, the second goes to the end of the screen and the third (and others?) go the the end of the file.