[galaxy-user] History items remain pending (grey color)

Dear Galaxy Users, Forgive me in advance, but I am a VERY new Galaxy user! I am trying to go through the Galaxy 101 tutorial provided on the galaxy website (https://main.g2.bx.psu.edu/u/aun1/p/galaxy101). The first step asks to get exon data of Chromosome 22 from UCSC database, and the second step asks to get the SNP data from the same database. When I do these two steps, I understand the history items should turn green once they are processed, however after a few hours these items remain grey. Am I doing something wrong? Any help would be greatly appreciated! Thank you in advance, Priya