(Updated Monday, July 25th, 2011) Snow Leopard's latest Software Update included an update to Remote Desktop Client v3.5.1 which changed the way right-click is supported. We've identified the issue, put together a solution, tested it, and have submitted it to the App Store. We have even asked Apple to expedite the review process given the criticality of the bug. Depending on Apple, the update could take anywhere between 2-10 business days to be available for download.

(Updated Wednesday, July 27th, 2011) This has been fixed in iTeleport v5.1.1.