I have travelled to the US on B1/B2 visa and later on an F-1 visa. Due to a personal emergency I had to leave midway in the program while I was on an F-1 visa. But I'd informed the graduate office, my professor and completed the necessary formalities.
Will I face an issue if I were to travel to the US again. Do I need to reapply for a US visa since I already have a B1/B2 visa which is still valid?