Upgraded to WordPress 3.5 problem

Delete them. If that doesn’t work you can always reinstall them.

I understand. My follow-up was that I got a fatal error (white screen) when trying to delete. Should I delete from ftp, file manager?

You can create a folder in ftp to put the plugin files in temporarily to see if that resolves the issue.

Did you try switching to another theme to see if it is theme related.

It could be whitescreening if your theme author hardcoded some dependencies on NextGen (as some sillier ones do) — just change to twentyeleven or twentytwelve and give that a go to get things straightened out.

Ok, George, I switched to twenty ten and the widget area works. I’m able to view the text tab.
But now what, lol?! Do I go back to my desired theme?

**Update: When I tried deleting the nextgen with the twenty ten theme active, I still got the white screen.

Okay, so it’s the theme causing the issue.

Your next step is to contact the Theme Author and see if they have an update to remedy the issue.

Ok; thanks

Meanwhile, is there a way to go back to the former version of WP?

https://etuts.org/manually-downgrade-wordpress/

Thank you, George! I appreciate it.

Those that are disabling plugins there will be an include line in the main plugin file:

wp_register_script( ‘sct_jquery_datepicker_slider’, plugins_url(‘jquery-ui-1.8.13.custom.min.js’, __FILE__));

This will vary from plugin to plugin, as mine is called SCT, but as you see this is an include for a custom jquery file. I just removed it and problem solved ;).

Credit goes to the developer that helped me out.

Yes, I got the same problem, here is the solution to fix this issue
https://www.hoosoft.com/blog/fix-jquery-1-8-3-error-typeerror-e-is-undefined-in-wordpress-3-5/