I believe it's possible. It's why I only use it in cascades. Yet, where's the practical attack where IDEA and Blowfish traffic are decrypted with ciphertext? If it's malpractice, then they're either fully decryptable or will be soon based on existing attacks on specific numbers of rounds or implementations.

I would appreciate you to cite evidence of people decrypting files protected by Blowfish or IDEA by breaking the cipher.