"MDL might temporarily go offline while we make adjustments to the server. Please be patient." Something went wrong with the "server update", I hope everything goes well, really!
H'mm my start button has stopped working and I have no idea why...Cortana is still working so can use her to check for updates.
Well solved it:- tried sfc /scannow and it got to 33% and a message came up "windows resource protection could not perform etc"..well that was useless. Anyway booted into another hard drive with win 10 (not insider) and scanned the faulty drive with sfc /scannow that got to 100% but a message came up couldn't fix corrupt files in Windows resource etc h'mm anyway if fixed the start button.
Stop using registry cleaners and removing things, In QUICK LINKS in my Sig, there is link to repair image with DISM
Not sure that it is exactly "reliable", but it adds really great value and flexibility to Windows 10. I use it too.