CSS styles not loading after upgrading from 5.2.4 to 5.3.4

[Mark.B]

AdminCP > Maintenance > General Update Tools > Rebuild Styles.

[panoramia]

Hello everyone,

I just upgraded vBulletin from 5.2.4 to 5.3.4 and all the styles are gone I've spent hours trying to see what the problem would be but no success. The adminCP shows no errors loading templates, everything looks fine.

I don't know why the upgrades are such a PITA, it never works well the first time

I've attached two screenshots showing the mess with no CSS styles being loaded. My programmer has checked everything he could think of, server logs, everything, but it just does not load correctly.

What is the cause of this problem? Anyone can help?

Thanks in advance!!