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Not to recite the blessing of “Sheasa Li Kol Tzarki” on the ninth of Av and Yom Kippur:
The custom is to recite all the morning blessings even if one did not receive the particular pleasure that the blessing corresponds to. Nevertheless it is proper for one to receive the pleasures of all the blessings that he recites. In all cases that one did not receive the particular benefit that corresponds to a particular blessing then that blessing may not be recited until Alos [daybreak].
 Siddur based on Arizal in Peri Eitz Chaim Shaar Habrachos 4; opinion brought in Levush 554/17; Sefer Haminhagim p. 47 [Hebrew]. So also rule the following Poskim: Kesher Gudal 5/19; Zechor Leavraham 1/300; Beis Oveid 10; Shaareiy Teshuvah 46/12; Kaf Hachaim Falagi 9/11; Yifei Laleiv 3/4; Ben Ish Chaiy Vayeishev 12; Maaseh Rav 9; Mamar Mordechaiy 46/10; Kaf Hachaim 46/17; See also Sdei Chemed Peas Hasadeh Asifas Dinim Bein Hameitzarim 2/9 [Vol. 8 p. 765 Kehos]; Otzer Minhagei Chabad p. 217; 250; Chikrei Minhagim p. 185
Other Opinions: The following Poskim rule the blessing is to be recited as usual: Levush ibid; M”B 554/31; Alef Hamagen 619/47; Darkei Chaim Veshalom 775
 This is due to that one is not allowed to wear leather shoes on these dates, and thus there is no worldly pleasure received from leather shoes on these days. [Peri Eitz Chaim ibid]
 Sefer Haminhagim p.47 [Hebrew]; Hayom Yom 9th of Av and 10th of Tishreiy; This was a directive received from the Tzemach Tzedek in name of the Alter Rebbe. So also rules Ben Ish Chaiy ibid
Other Opinions: Some Poskim [Gra in Maaseh Rav 9; Mamar Mordechai 46/10] rule that the blessing is to be said at night after the fast.