Do you see task and options to the left?

If not,  go to change user settings and toggle to classic mode.  Exit.  Log back in and go to change user settings and toggle back to standard mode.  Exit.  Log in and try explorer again.

Apparently that reset something in the user settings.

Tom, you are my new best bud! 

You are welcome.

That one frustrated me for quite a while before I figured it out.

We are on Sage 100 Premium 2021 7.00.4.0 32 bit, so I don't have the option to change from Classic to Standard mode (though I did attempt a fix by changing Theme code with no effect). Any suggestions for how to reset user settings so that data populates in BI Explorer views? 

Did you look through Solution ID 78517?

Option II: Delete Damaged Registry Subkey
Delete Registry Subkey (HKEY_CURRENT_USER\Software\Sage Software\BIE Explorer\Explorer)
See Article ID 93618 Business Insights Explorer Views appear blank for users that use Standard View for
instructions
Check the Views location in Business Insights registry keys:
Check the ViewsPath value under the registry key: HKEY_CURRENT_USER\Software\Sage Software\BIE
Explorer\Products\MAS90

Of course this KB comes with the standard disclaimer, including: 

"Modifying your Windows Registry incorrectly can severely affect system
operations. Sage is not responsible for operation issues caused by incorrectly modifying your Windows
Registry. Always create a backup of your data before proceeding with advanced solutions."