The easiest fix without wasting too much time on it is to change the animations array where that random option gets the animations to play.  You’ll have to use the uncompressed development version to make the changes. If you downloaded packed production version you’ll have to download the production version separately.

Open the file jquery.nivo.slider.js in your favorite text editor. Go to line 309 and remove all effects that has anything to do with “up”. Namely, remove “sliceUpRight”,”sliceUpLeft”,”sliceUpDown”,”sliceUpDownLeft” portion of the array. I couldn’t figure out which one of these effects was causing the problem so I ended up removing all of them. The rest of the effects seem to be doing a good job and I think I can live with that!

Here are the before and after pictures to make it clearer for everyone.

Or you can just copy and paste the corrected code from below:

if(settings.effect == 'random'){
var anims = new Array("sliceDownRight","sliceDownLeft","fold","fade");
vars.randAnim = anims[Math.floor(Math.random()*(anims.length + 1))];
if(vars.randAnim == undefined) vars.randAnim = 'fade';
}

If anybody figures out the real solution to this problem please make a comment below and let us know too.