Welcome to the Toolset support forum. I'll be glad to help you!
A manual reinstall process can fix this issue. Could you please give it a try on your end? Just follow these instructions:
- Backup your site and database
- Deactivate all Toolset plugins, and then delete them (it is a safe procedure, you won't lose your data)
- Go to https://toolset.com/account/downloads/ and download the latest Toolset plugins, then extract it
- Upload the plugin via Plugins -> Add New
- Now please go to https://toolset.com/account/sites/
- Find the key of your affected site and erase it
- Create a new key and copy it
- From the WordPress dashboard navigate to Plugins -> Add New -> Commercial, Click on "unregister the site" on the right top next to Check for updates
- In this same plugins panel, click under the “Register” button below WPML plugin
- Add your new Site Key copied above
- Download and activate all needed Toolset addon plugins
Then, check if the issue persists. Please keep us posted about it.