There is a strong controversy going on since years about the forehead tilaka.style among both sects of sri vaishnava.
The rivalry between the Tenkalai and Vadakalai sects of Iyengar Brahmins plunged to lower levels recently, with a fresh controversy emerging at the holy Hindu hill shrine of Venkateswara in Tirumala over how the idol should look. One of the groups has decided to move court against the other over the alleged change in the style of "Namam" or forehead-mark of the presiding deity.
According to a report in Deccan Chronicle, members of one sect intentionally changed the style of "namam" on the forehead of the idol of Lord Venkateswara. Though it is unclear as to which sect changed it, the TTD has allegedly excused the accused priest from Abhishekam duty. Priests of the Vadakalai sect wear the Tirunamam or U-shaped namam, while those of the Tenkalai sect wear it in the shape of the alphabet ‘Y’. An apparent change in practice on what adorns the sacred idol has resulted in one of the sects planning to approach a court of law against the other sect.
Why is there a fight amongst the Sri Vaishnavas regarding "namam" of Lord Venkateshwara?