Tax Season hellish nightmare - I had this problem, and blame Windows updates (even if not true time, it probable is for 85% of the issues) and it definitely sucked up my time but the solution for me was relatively simple. Run the 'Lacerte Tool Hub'.  Make sure you're on the latest version. On the left side > Support > Update Lacerte Tool Hub. Then left side > Program > Run Component Repair.

After go back and select > Reset Display. Then go back on the left side select > Data  > RunCL Pack.

Restart your computer (just for giggles) and if the issue isn't corrected, open the Tool Hub, left side > Install > WebSetup/force this doesn't correct the issue.