Bummed for hours

I installed your update which was a mistake. All my galleries are now inoperable! I have a lot of them, which are not mine, but my clients who will be contacting me soon to find out what the heck is going on. I’ve been trying for hours to get it back the way it was but nothing is working and I’m just wasting my time. I guess the old saying is true – if it ain’t broke, don’t fix it. Everything was working great before the update. What’s going on????