Vapor Theme: Lost Transparency on Panel -- How to Fix?

Hello everyone! I recently switched to this wonderful distribution. However, I decided to reinstall the system to remove unnecessary stuff and keep it clean. I really liked the blur and transparency effect in the default Vapor theme. Before this, I had only seen something like that on Windows 7, and here it looked so beautiful that it convinced me to stay on this system.

But yesterday I noticed that the transparency in the Vapor theme disappeared, and the panel itself turned dark gray. I tried everything I could, but nothing worked. Maybe you can help me?

Here’s what I tried:

  • Enabled the Translucent effect for the panel;

  • In the settings: System Settings / Window Management / Blur — I changed every option available;

  • Also switched themes, but nothing helped.