[CLIENT] Unexpected platform error

When you give two separate mastery pages the same name but have different letters capitalized (eg: Draven and draven) when you attempt to save one of the pages a message pops up stating that there was an "Unexpected platform error" this message then follows you throughout the client every time you attempt to use masteries (whether you are just switching between pages, editing, adding pages, etc.) Resetting the client fixes the problem but deletes any changes to masteries since launching.

Should you attempt to play a game without having reset the client you will be unable to change from the mastery page you used in your last game and are also unable to edit pages.

I do not believe this is new to 5.5

Edit: this can be replicated 100% of the time.