This week marked the start of the semester for hundreds of colleges across the U.S. But many international students, plagued by difficulty getting visa appointments and unusually high rates of visa denials, are still unsure if they’ll be able to attend college in the U.S. this year. At the University of Maryland Baltimore County, a midsize public university that has a student body composed of about 15 percent international students, international Ph.D. and undergraduate students appear to be largely unaffected by visa issues. But the rate of visa issuance for master’s students is only about half what it has been in previous years, according to David Di Maria, UMBC’s vice provost for global engagement. Most of UMBC’s master’s students are from India, the country that now sends the most international students to the U.S.—but which experts say has had virtually no visa appointments available for the past several months.