Hi, I recently have my site:

Change to another vps provider,

Chage of domain,

and udpated to last version,

but blocks not available....which problem is?

That doesn't tell much, unfortunately. Try looking at your browser's console, there should be a more specific error logged there.

Do you mean this?

Yes, that. However, the console is showing a generic 500 error, so you need to check your server's logs to find out the real error.