Dear all, Since the customized Theorem structure is already complicate, I just extract \index from the title as following: \startTheorem{\bf title of theorem} \index{title of theorem} bla bla bla \stopTheorem In this way, I cleared the message "[entry not flushed]” in the indices. There may be a better way. However, I couldn’t locate what hindered the resetting of counter Exam yet. I have to check the definition in the environment file one by one. Thank you for reading. Best regards, Dalyoung