Lightroom Classic Mac rotating and changing image when switching to develop

Suddenly, when moving to Develop, the image changes in inconsistant ways before any adjustments have been made. Usually rotates 90 degrees left and distorts/stretches to fill the image area. Sometimes it does not rotate but image is cropped so that a vertical is cropped to horizontal or if horizontal it is stretched. The image always is made darker by about a stop, but there is no indication of these changes in the Develop controls. When switching back to Library mode, the image is again a uncropped vertical, but one stop darker. Tried rebooting computer, but no change -Help please!

On Mac Mini M1 Big Sur 11.2.1 - LR 10.1.1