so what the fucking card says? it says "the equipped monster can attack YOUR opponent". and let me define the YOUR description from the card, the YOUR standpoint is from the one who controls the equip card, not the YOUR from the equipped monster stand point.
that means, if player A equipped star bow ceal to player B's monster, the "YOUR" opponent is still from player A standpoint since player A control ceal, so player B's monster can only atk directly player B, which is impossible
there no bug on this card if you equipped it to your card you can direct attack someone. you just have to be careful since the attack slide is so touchy, when you go to attack make sure the attacking arrow in in the back before you let go.
I just encountered a very strange bug involving this card while duelling against the Reverse Trap Standard Duelist. He equipped Shooting Star Bow - Ceal onto my creature but on my turns I could not attack his life points directly? (Even on Auto-Duel, my character did not attack.)
Later in the duel he equipped his own monster with a Star Bow and he didn't attack me directly either.
There were no other cards on the field preventing us from attacking.
Thank you for your information. That is exactly wired. Although I am not sure why that happened and I cannot fix it since I am not an official developer, this comment will help you other players who encounter the same problem.