After updating Windows 10 Pro to Fall Update 1151 (10586.71), I noticed my start menu tiles - that used to be transparent - now have the colored tile borders around them. While they change when you change the accent colors in Windows, I liked the transparency, as they once were. I've only seen a few people that actually had tiles that were ever set as transparent backgrounds, so I'm hoping creating a thread will get responses from those who've had this / know if the update caused it / maybe a way to set it back. I'm really hoping there's either a registry key to revert this back or a 3rd party program people know of that can achieve this effect. See screenshots below & thanks in advance!

Initial install (build 10240) Tiles with transparent borders:
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After installing Fall Update / Build 1511 - 10586.71:
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