Before reading further please note that I was previously running VLC 3.0.2 on Win10 1709 (Version 10.0.16299.402) without encountering this.
Last night I upgraded to 1803. Around 11AM my wife called me and told me that everything was blue. People in the DVD's she was trying to watch looked like they were in Avatar... The Desktop wallpaper of our media system had also gone from reds to blue after coming out of the video. She rebooted and all was fine. Started watching and blamo everything was blue again. I got home and she wasn't kidding. Here's a reproduction example:
No matter the video (DVD, x264, x265 or other) after going full screen once or a couple of times this happens.
To my shock when I spoke with a rep earlier today at AMD Support he directed me to the fact that interestingly ASRock has a NEWER VGA driver set than what you can download via AMD currently. This is what they have:
This driver set can be found on their download area for multiple ASRock boards. In this case I have the X370 Pro4. I was skeptical but he was right. This would be the first time in my lifetime that I have found Chipset/Graphics drivers that are newer on a product manufacturers website than what I can get from the manufacturer of the core technology but at any rate these drivers did not fix the issue this evening.
After finding that the "BETA" drivers from ASRock did not resolve this issue I tried portable VLC 3.0.1 and 3.0.0 with both exhibiting this.
The good news is this doesn't happen with VLC 2.2.8. Hope this helps someone out there. I am going to file a bug with VideoLAN but since they are a non-profit I hope AMD takes this up with Microsoft.