Today it happened to me - the video doesn't play, and asks me to disable the adblocker. Yesterday, on the same computer/browser, it worked perfectly fine and played the ad.
I do not have an adblocker installed, nothing like it in my Chrome extensions (the enabled extensions are Adobe Acrobat, Google Docs Offline, Norton Identity Safe, Video Download Helper, Save to Facebook, and in addition the Chrome apps: Docs, Sheets, and Slides.).
1.124.e9b051513e (06.04.2018 8:27), pengolodh-sc (137756), zz1, en_US, WEB 7,1,1,0, Windows 10, Chrome/65.0.3325.181, 2048x979, OpenGL Vendor=WebKit Version=WebGL 2.0 (OpenGL ES 3.0 Chromium) Renderer=WebKit WebGL GLSL=WebGL GLSL ES 3.00 (OpenGL ES GLSL ES 3.0 Chromium) (512 MB VRAM)