Theme not uploading, Theme Details not opening

[TLCJohn]

Hi there,

I am playing with 5.5 and seeing what is new and good about the latest version. I am trying to upload a theme, Page Builder Framework and it just will not upload. On the other hand there are a large number of themes added and when you click on theme details to delete the theme it will not work. Here is the list of plugin that are on the build.
Advanced Custom Fields PRO
Deactivate
Customize WordPress with powerful, professional and intuitive fields.

Version 5.8.12 | By Elliot Condon | Visit plugin site
Enable auto-updates
Select Akismet Anti-Spam
Akismet Anti-Spam
Activate | Delete
Used by millions, Akismet is quite possibly the best way in the world to protect your blog from spam. It keeps your site protected even while you sleep. To get started: activate the Akismet plugin and then go to your Akismet Settings page to set up your API key.

Version 4.1.6 | By Automattic | View details
Enable auto-updates
Select Beaver Builder Plugin (Pro Version)
Beaver Builder Plugin (Pro Version)
Deactivate | Change Log
A drag and drop frontend WordPress page builder plugin that works with almost any theme!

Version 2.3.2.6 | By The Beaver Builder Team | Visit plugin site
Enable auto-updates
Select Beaver Themer
Beaver Themer
Deactivate
Easily build Themer layouts for your archives, posts, 404 pages and more!

Version 1.3.1 | By The Beaver Builder Team | Visit plugin site
Enable auto-updates
Select Custom css-js-php
Custom css-js-php
Deactivate
Write custom code for php, html, javascript or css and insert in to your theme using shortcode, actions or filters.

Version 2.0.7 | By flippercode | View details
Enable auto-updates
Select Disable Comments RB
Disable Comments RB
Settings | Deactivate
Easy tool to disable comments for your blog posts, pages. Admin can disable comments in just few clicks. Delete comments from blog post.

Version 1.0.9 | By rbPlugins | View details
Enable auto-updates
Select iThemes Security Pro
iThemes Security Pro
Settings | Deactivate | License
Take the guesswork out of WordPress security. iThemes Security offers 30+ ways to lock down WordPress in an easy-to-use WordPress security plugin.

Version 5.3.3 | By iThemes | Visit plugin site | Get Support
Enable auto-updates
Select PowerPack for Beaver Builder
PowerPack for Beaver Builder
Deactivate
A set of custom, creative, unique modules for Beaver Builder to speed up your web design and development process.

Version 2.8.2.1 | By IdeaBox Creations | Visit plugin site
Enable auto-updates
Select ShortPixel Image Optimizer
ShortPixel Image Optimizer
Settings | Deactivate
ShortPixel optimizes images automatically, while guarding the quality of your images. Check your Settings > ShortPixel page on how to start optimizing your image library and make your website load faster.

Version 4.19.2 | By ShortPixel | View details
Enable auto-updates
Select Swift Performance Lite
Swift Performance Lite
Settings | Deactivate
Boost your WordPress site

Version 2.1.3 | By SWTE | View details
Enable auto-updates
Select Ultimate Addons for Beaver Builder
Ultimate Addons for Beaver Builder
Deactivate
Ultimate Addons is a premium extension for Beaver Builder that adds 55+ modules, 250+ templates and works on top of any Beaver Builder Package. (Free, Standard, Pro & Agency) You can use it with any WordPress theme.

Version 1.27.0 | By Brainstorm Force | Visit plugin site
Enable auto-updates
Select WordPress Beta Tester
WordPress Beta Tester
Deactivate
Allows you to easily upgrade to Beta releases.

Version 2.2.10 | By Peter Westwood, Andy Fragen | View details
Enable auto-updates
Select WP Compress | Image Optimizer
WP Compress | Image Optimizer
Settings | Deactivate

[SergeyBiryukov]

Hi there, welcome to WordPress Trac! Thanks for the report.

Replying to TLCJohn:

I am trying to upload a theme, Page Builder Framework and it just will not upload.

• Could you clarify what happens when you upload a theme?
• Does the issue still happen with all plugins disabled?
• Does it happen when you upload a different theme?

On the other hand there are a large number of themes added and when you click on theme details to delete the theme it will not work.

Are there any JavaScript errors in the browser console?