Drag and Drop not working

I have been trying to debug this problem some more and I’m thinking this is caused by a javascript error.
I’m not sure what is causing it yet, but at this point I believe another plugin might be causing it.
I’ll keep you updated.

Hello,
Sorry for the delay in my reply.

In order to test for javascript conflicts, you can either deactivate all plugins, and begin reactivating them one by one (going back to see which one causes the original issue).

Or, you can use this handy dandy Codex page.

Please let me know if you get stuck anywhere along the way.

I’ve already tried disabling all plugins, the problem remained.
However having said that I also went to one of my other WordPress installs and the problem didn’t exist over there.
In the meantime I’ve tracked the problem down to WPZOOM and the Meeta template, this seems to be causing the JavaScript error.

Seeing as this has nothing to do with your plugin, you can set this topic to solved as far as I’m concerned.

Thanks for your reply and your work in both Ultimate TinyMCE and WP Edit

Gotcha.
Thank you, kindly.
If I may be of more assistance, please let me know. Even if it doesn’t have to do specifically with my plugin; I’m still happy to help.

Ok so I’ve tracked the issue down to /wp-includes/js/jquery/ui/jquery.ui.core.min.js.
Somehow this file was modified (extensively) by something and had an error, but I was unable to find exactly were the error was.
I went to one of my other installations of WordPress and have overwritten the file with that one (I’ve backed up the ‘wrong’ file).
It now appears to be working.

Question remains is why was the file so different and what consequences might this have.

Is it possible some plugin changed this file?

By the way, thank you for your support.

That is strange.
As far as I know… nothing should ever modify the core version of javscript included with WordPress.

As long as you copied it over from another site running the same version of WordPress, you should be okay. Alternatively, you could always download a fresh copy of WordPress, and take the file directly from that location. There should never be any changes to core WordPress files in between WordPress versions. The only changes made to the core WordPress files should only be done by WordPress itself.

I’d monitor the file. If you picked up a “questionable” plugin somewhere; then pretty much anything is possible. Monitor the file every few days.. and if you see it changing again, post back here and we can help further.

That’s what I thought, all plugins I have have been there for quite some time, the problem only started when upgrading from 3.8.x to 3.9.
None of the plugins I use are what I’d consider questionable.

Well I’ll just keep an eye out for any strange behavior, for now it appears to be fixed.

Thanks for your help again!

Just a little follow-up:

I noticed there were a few more errors all related to jquery.ui / jquery.
When I had a look at the date the files were changed they were older than the day I upgraded to WordPress 3.9.
On my other site these files all had the changedate set to the date I upgraded.

This makes me think somehow the files didn’t get updated for whatever reason.

I replaced the entire jquery folder with the files from the other site and now everything is working.

So just a heads-up, there might be an issue with the update to 3.9 where sometimes files don’t get updated/replaced.

Very good work. Exactly what I would have done.
I’d check the rest of the functionality of your site (comment to yourself, contact form yourself, etc.), just to verify the rest of the WP core files are working properly for you.