AFNI itself sets the cursor to be a NorthWest pointing arrow, yellow body and blue outline. If you don't see this when you use AFNI (that is, when you click into an AFNI window somewhere -- or its titlebar -- to make sure it has "focus"), then the problem isn't AFNI, it is the X11 window manager.
I'm not sure what to say about this. You probably can set the cursor used by your window manager somehow from the RedHat control panel, but I've not had this problem, so can't give you a specific cure. You could try using another window manager -- you should be able to set that from the RedHat control panel as well, somewhere.
bob cox
For a bonus point, does anyone out there
who doesn't work for me know why AFNI actually uses two slightly different cursor arrow shapes? This situation isn't an accident; it actually means something about the user interface.
If you collect 100 bonus points, we'll give you a gold star. With 50 gold stars, you qualify to have your picture included in the AFNI splash screen. Oh wait, anyone can do that. Well, we'll try to think of a reward for those 50 gold stars.