I'm having trouble with a plugin that worked for me up till the latest Atahualpa upgrade (3.7.13) called Portfolio Slideshow. I wrote to the designer, and this was his response:

You're getting the following JavaScript error on that page:

TypeError: jQuery.browser is undefined

This is not coming from Portfolio Slideshow Pro, it seems like it could be coming from your theme (or maybe another plugin). Are you able to temporarily activate a default theme like Twenty Thirteen or Twenty Twelve? If so, activate one of these themes and see how the slideshow behaves in it.

Turns out he was right, the plugin works fine in other themes.

I don't know how to fix jQuery problems, therefore I think I should roll back to a previous version of Atahualpa.

How do I go back? Where do I find older versions to download?

Just where are you seeing the error?
I just installed it (V1.5.1) on WP 3.8/ Atahualpa 3.7.13 and it is working for me.

I don't know. It's the plugin designer that told me about the error. I'll ask.

There's definitely something wrong. I also see that the Humans-not-bots plugin is not working.

Also, I'm not getting the Wordpress "black bar" at the top of pages when I'm logged in.

I've tried turning off some plugins, then all plugins, but I don't see these problems resolve.

I just switched themes to check the black bar issue. It works on twenty twelve. Went back to Atahualpa, and the black bar is gone.

On the plus side, humans-not-bots is working on Atahualpa now.

So what is not working? Like I said, I installed it and it seems to work for me.

Sorry, I forgot to include a link.

http://mammothpro.com

The slideshow is not advancing (either automatically or by clicking).