There is a warning box from toolset that it can't register toolset while I have a new key for the website. I guess there is something with toolset blocks. When Blocks activated I can't use the theme "Cutomize" in backend. It gives me a wordpress error (see screendump) And when de-activate toolset blocks no problems to customize .
I've made several new registrationkey's (no help)
I've de-activate cache plugin (no help)
To ensure that your key is validating correctly please follow the instructions below.
This error generally occurs when you've migrated your site and the url changes and your Toolset plugins can no longer validate with our servers.
To check if your plugins are able to validate correctly you will need to go to Toolset -> Dashboard, then click on help in the top right hand corner. Select the Toolset Debug tab then click "Toolset Debug Information and Troubleshooting"
From there you will be taken to the Toolset Debug information. Scroll down on the page until you see the link for "Installer Support". Click this link.
You should now be able to see your site validation information. If you're see "Toolset site key not matching for hidden link" then you will need to regenerate your site as the URL may have changed and your key isn't validating for the current URL.
Thanks for your apply! The customizer issue is dissolved thansk for that.
About the registration still giving that error. I've followed all your steps with the "Installer Support" bu t the log file is empty. See screendump. What next to do?