Why are historical prices no longer in portfolio?

CSL

I have multiple accounts with many securities and keep them updated either by syncing or by entering the prices every week or so. All of a sudden there are no prices showing for tow securities that i have owned for years and there are no historical prices and i can't input the prices for earlier dates.

Sherlock

I suspect your Quicken file is corrupt.  If you haven't already, you may want to review: https://help.quicken.com/display/WIN/Troubleshoot+a+damaged+Quicken+data+file