Scary visitations

All kinds of weird downloads have been jumping on to my podcaster lately.  Yesterday an upper intermediate from last year came down.  Today a newbie arrived from 2006! (That gave me a chill down my spine!)  Maybe this is normal and I don't take much notice of what arrives.  But I have noticed that The Jenny Zhu Show does not arrive at all - was it something I said, Jenny?  Has anyone else noticed this lind of random behaviour or is my poscaster unusually wilful?