Hello [name]! Thanks for joining the GMC. Before making any posts in the Tech Support forum, can we suggest you read the forum rules? These are simple guidelines that we ask you to follow so that you can get the best help possible for your issue.
Okay, that's weird... haven't seen this one before.
Let's start with the simple ones: Try closing and re-opening the IDE. If that doesn't help, try restarting your computer.
If that still doesn't help, let's first try to find out what could be causing it.
For starters, please check whether the icons in the folder C:\Program Files\GameMaker Studio 2\GUI\Skins\Dark\Images\IDE_Toolbar (default install path - if you changed it, please adapt the path) are also blank white. Note that the icon files are white with a transparent background, so you'll have to select them to see the non-transparent bits if your file explorer's background is also white.
If they're visible here, chances are something is preventing the IDE from loading them. The first thing that comes to my mind here is antivirus or firewall software, so please try temporarily disabling those and then launching GMS 2.
Please let us know if any of this makes any difference.
If you've only just installed it, try uninstalling and reinstalling, maybe the install got corrupted by accident?
Also, not to accuse anyone of anything here, but did you get the installer from the official website or somewhere... else... online?