It's now very clear why Kodak Black canceled his show in Boston ... the rapper was arrested on weapons and drugs charges at the U.S. Border. Law enforcement sources tell TMZ, Kodak and 3 other people were stopped by U.S. Customs Agents Wednesday. Also, Wendy Williams is uneasy with the fact her estranged husband, Kevin Hunter, is still working on the set of her show -- so much so, she's decided to keep extra bodyguards on hand 'til he's out.