I was installing some updates yesterday. When I reopened Logos, it has not finished stage 2 of the preparing your library. Here are the Log files.
6431.Logos Log Files.zip
The presumably recurring problem is trying to replace the library catalog index, so close Logos and the Indexer if necessary, and delete the folder
C:\Users\scott.dragoo\AppData\Local\Logos5\Data\zlkfgwd3.gbt\LibraryCatalog
Start Logos with Ctrl key held to generate logs and start with a blank layout. Let it index.