My LR Gallery is gone

Hi, I have added several shared albums to a gallery in Lightroom over the past coupe of months. Today, the whole gallery has just disappeared. Does anyone know what happened? I can make a new gallery and re-add the albums to it, but I am just wondering why this happened, I haven't deleted it, and I don't think any of the album share members would be able to accidentally delete my gallery. Did Adobe make some changes I don't know about? Thanks for any insights.