Just tried a new never used sdhc card in slot in question and when I tried to add a file it said disk is write protected. Tried it in a diff computer and it worked fine.
As I said, all my cards worked in this slot for 1+ year and suddenly all are read only in this slot but work fine on other computer. They are all SDHC and not used in cameras.
My sd card slot has worked fine on my 4 different sd cards since 8 came out, but suddenly all cards are read only (and work fine on other computer). So I believe it is a card reader hard/soft problem.... Any thoughts? Thanks