Problem started about a week ago when suddenly no Website natively pinned to the Desktop would open anymore. Even with newly created Tiles linking to a Website, whenever I hit them it'll only open an empty Internet Explorer Tab, not the Website that was linked to it.

Apps, like the Store, Calendar or any 3rd Party App work fine.
Oddly enough, Tiles linking to Websites created by OblyTile work fine - Hence the emphasis on natively.

Any ideas what the cause might be or a suggestion how to solve it?

Thanks in Advance =)