Is anyone having issues with multiple bank and investment accounts not updating activity and also the investment tab disappearing? I checked for updates, restarted both Quicken and my computer and nothing resolved the issues.
No. It sounds like you might be experiencing some data file corruption. Start troubleshooting by Verifying and Super Verifying your data file.
@Admasi it sounds like you are having more than one issue.
For your investment accounts not updating
For your Investing tab not showing, click on View→Tabs to show and verify that "Investing" is checked.