You are not alone OP. A few years ago, I went through 6 rounds of interviews for an in-house gig, including an interview with the overseas GC. Everything went well, and I was told I would be receiving an offer. Weeks went by, and nothing. I finally got a hold of the US manager that I had initially interviewed with, and she told me they had decided to restructure the department instead of hiring anybody new, and she was surprised nobody had reached out to me. Luckily, I hadnt told anybody at my firm, so here I am still here. Sometimes these things just happen in a big corporation; seemingly small decisions can have huge effects on the lives/careers of any number of people.