yeah, mine has been really buggy lately with the adds. Normally I don't mind the ads that pop up at the bottom of the screen, but lately, they have been videos and it is really buggy when it is trying to load them. When I have tried to play a playlist I press the button and nothing happens, I have been having to completely reload the app and restart it again just to get it to work. I thought it was my wifi but it seems to just be the app.
I was able to get this to work after updating Chromium on my old Acer Chromebook and restarting. I discovered that I was using an old 2014 build, but I was able to upgrade via the "Help -> About" screen. My ChromeOS build number is now 53.0.2785.154.
I have an older Chromebook here at work, and there's a little hamburger menu (i.e. three horizontal lines) to the far right of the URL bar. When I click on that, there's a "Help and about" menu item in the menu, and there's an "About Chome OS" menu item within that submenu. This brings up a page with a button that says "Check for and apply updates."
The naming of these men items seems to be slightly different between versions of Chrome.