I discussed the issue of how the Lubavitcher Rebbe was a prophet with a Chabadnik last night. He said every Lubavitcher has heard amazing stories of prophetic ability regarding the Rebbe and thus he obviously was a prophet. The following are two stories that he personally knows the people involved and vouches for their authenticity.
1) An 8 year old Romanian Jewish girl was seriously burned. The family took her to the hospital where she was given intensive care. They were told that she needed to be left alone for two weeks and that the family should return then. Two weeks later they were informed that she died. But the way the information was conveyed they realized the nurses were lying and that she probably had been kidnapped. After searching to the best of their ability they lost hope of ever seeing her and emigrated to Israel. She had a brother who grew up to be a serious talmid chachom. At the age of 17 he developed cancer and the doctors gave up on him. In desperation he went to to New York to get the Rebbe's beracha. The Rebbe told him not to work that everything would work out. Then he decided to ask for a beracha to find his sister. The Rebbe gave him an extra dollar and told him that miracles would happen in 5761 - nine years in the future.. He returned to Israel,his condition rapidly improved and he was considered cured. He got married and settled in Bnei Brak. The family grew. One day his wife complained to him that she was overwhelmed taking care of the kids and also cleaning the house. He promised her that he would get help so he went out to the area where the foreign workers hung out and found a young lady who agreed to come and help clean. Things worked out fine, but he had a strange feeling when ever he looked at the worker. He found out she was Romanian and started talking to her in Romanian. She stated that she didn't remember too much about her childhood having been separated from her family at the age of eight. But she did have a picture of her mother. Lo and behold it was his mother - it was his long lost sister - and it was the last week of the year the Rebbe had said miracles would happen. The rabbi who told me the story noted that this was even a harder call since Romanian workers were only common in Bnei Brak for one or two years in recent history.
2) An Austrailan acquaintance of this rabbi had a Bobover chasid friend. The Bobover chasid took the chabadnik to meet the Bobover Rebbe. The Bobover Rebbe told them about a recent tradgedy. A young woman had married several months before. Despite all predictions of a happy marriage it was a disaster. The woman protested that she wanted to get out of the marriage - but she was ignored and told just be patient. At some point she couldn't take it anymore and simply ran away. The Bobover Rebbe asked the chabadnik to please ask the Lubavitcher Rebbe for help in locating the young woman. The Chadnik stopped by 770 on the way back to Australia and told the Rebbe the problem. The Rebbe told him. When you arrive back in Melbourne immediately take the next flight to Brisbane. The Chabadnik did as he was told and found himself on a flight to Brisbane without the foggiest idea of what to do next. There was a woman sitting next to him who seemed very curious about him and his religion. After an extended conversation she said, "What does your religion hold about people who desert their religion?" The Chasid was surprised by the query but answered simply that one can never leave Judaism but there is always hope of persuading the person to return. She then told him, "I am the owner of a chain of clothing stores in Brisbane and I just got a new worker who used to be an Orthodox Jew - perhaps you could speak to her and persuade her to return to her religion." It of course turned out to be the missing wife. He was able to arrange for her to receive a get and she moved to Israel where she now lives with her new family and many kids.