Why adding a script caused client crash?

Hello team.
I made a poseball, i think the script was from the page below, After I had it right I decided to add a simple texture animation script to the ball. A moment later my client crashed.
I returned and I crashed again.

A third time...same. I logged an alt and went to look. Crashed again.
It seemed that viewing from a distance (alt cam) It would not show up. I moved closer. I guess, as it rezzed I crashed again. I could not load this ball before crashing. The whole sim was in peril as it slowed to a crawl. On logging agian in I was at zero co-ords and could not get out.

After successfully logging to another sim I contacted live help. A nice Linden arrived promtly. It seemed a sim reset was in order,
I haven't gone back on yet but assume all is ok now.

Does somebody have an explanation for this and maybe tell me/us why this should not be done? I don't want to do this again.

Free, open-source pose ball code for anims - EASY, low lag!
/15/d7/49960/1.html

UPDATE:
The reset didn't fix it because the ball and script were still there. Any attempt to go near it caused a crash.
On relogging, a couple of times, instead of my "home position" I was underground near a sim corner and trapped. No teleporting or sitting got me out of it..Relog...
Funnily , while there I saw a couple of my builds with me underground. I assumed they were copies so I deleted them.
On next successful login they were gone from my property.
Another help request and a kind Linden found the ball and returned it to my lost and found... I deleted it!
All is good with the world now except some rescripting and rebuilding what was lost.
Let this be a lesson.. The lesson of which I do not know.

Sounds like you had some sort of infinite loop going in your poseball or something...that's definitely not a normal result for a pose-ball.

If you can post your exact script, it might be helpful (both the sitting script and your texture animation).