MORE Windows 10 bugs! Too many Start menu apps BREAK it
Found on The Register on Wednesday, 29 July 2015

Start menu shortcuts are still shortcut files placed in the same special locations as previous versions of Windows, but the Start menu app appears to be driven by a database on which some optimistic Microsoft coder has placed a limit of 512 entries.
The workaround is to use a third-party Start menu such as Stardock's Start10. Since the underlying shortcuts are intact, these solutions still work correctly.
Is 512 the new 640k which ought to be enough for anybody?