Portfolio Manager uses Yahoo Finance for its stock quote updates. Every so often they have an issue however this generally only lasts a day or two. Another common reason is anti virus or firewall software blocking the internet connection from the program. Please check that this isn’t the case.
If that still doesn’t help please do the following:
- Open Portfolio Manager
- Click on Tools | Options.
- At the bottom is an option to set the quote source. Update this to USA or YQL.