The latest version is 12.0.1029. Reinstalling might help. You can adjust your preview render settings to help speed up your interface some.

These are what I use and have used for many years and they seem to work well. You can also adjust the 2 settings I marked for even better performance but it looks like garbage on the screen.

To get Lafemme back, you can load her into a new scene and set that as the preferred scene. Of you can tell Posewr to launch the factory default scene. Both would be under edit>general preferences on the document tab

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I use Poser 13 and win 10