Can you provide an example from the text where Udi was used to solve a specific psychological or spiritual problem?

Yes, Chapter 35 provides a clear example of Udi's power to resolve a distressing issue. A gentleman from Bandra was suffering greatly because he could not sleep peacefully. Every time he drifted off, he would be awakened by disturbing dreams of his deceased father, who would berate him with curses and abuse. After all other efforts failed, he was advised by a Sai devotee to use Udi. As instructed, the gentleman applied a little Udi to his head before sleeping, kept a packet of it under his pillow, and kept Shri Sai in his mind. The effect was immediate and profound. As Chapter 35 recounts, that very night he fell into a deep, peaceful sleep, and the 'place of bad dreams was erased.' This incident demonstrates the Udi's efficacy in removing troubles, particularly those of a psychological or spiritual nature, when used with faith.