Thanks to Danielle & the Pope

 

ר' יהודאי גאון writes, "For more than one hundred years both yeshivos (Pumbedusa & Sura) haven't been learning מסכת נדרים" "אנן לא גרסינן נדרים ולא ידעינן לאסור ולהתיר בה לא נדר ולא שבועה" This might explain why we have no Rashi on Nedarim  It will also explain why the entire  מהרש"א חידושי הלכות has no Chidushim but only corrections in the Girsa. When R. Yehoshua Shlomo and his son R Gershom Soncino,  printed the first   ש"ס  they printed only those Mesechtos the Yeshivos were learning. Ms. Nedarim was not printed because it was one of the Mesechtos not learned in the Yeshivos Danielle Bomberg*( a Goy) who got permission from Pope Leo X was the first one to print the entire ש"ס  ** including Ms. Nedarim. It was only after the printing of the Bomberg Shas, that Meseches Nedarim became part of Shas and Yeshivos started learning it.   If not for Bomberg the Goy & Pope Leo X, Ms. Nedarim might not have been part of the Daf of today. *born in Antwerp Belgium ** printed in Venice 1520 -23