I'm facing a difficult creative block. Is there a story about how Baba helped a devotee with a major intellectual challenge?

Yes, Chapter 20 recounts the story of Das Ganu, who was writing a commentary on the Ishavasya Upanishad. He reached a point where his "pen falters" and his mind was filled with insurmountable doubts. When he presented his problem to Sai Baba, Baba did not provide a direct scholarly answer. Instead, he gave a mysterious instruction: "That Kaka’s maidservant will resolve the doubt." As detailed in Chapter 20, this illustrates Baba's unconventional methods. He provided a path to a solution through an unexpected source, demonstrating that faith in the Guru's word can resolve even the most profound intellectual and spiritual challenges, often in ways we cannot predict.