I'm having trouble with simport too. I've hosted a few performers and I've sent one or two, but one of the first ones I sent (a magician) took a wrong turn apparently and never turned up at the venue. While he arrived home ok, his picture remained in the book as being on tour or awaiting a report. It said to click on his photo to cancel the tour, but nothing happened when I did that. Then last night, I had another magician whose tour failed and he too was stuck in the book as being on tour. While trying to cancel his tour I clicked on the first magician and he actually disappeared from the book, but my second magician is still listed as being on tour (even though I can still control him in game) and so, I cant send him anywhere now.
Now today, when I try to send someone on tour, it spins for ages and says it's booking the tour, but then comes up that the tour failed and to try again, plus nothing at all happens if I try to book one of my venues for a visiting performer.
Hope it all gets sorted soon.