It seems the current download for version "00IRG530-Renditioner-Pro-3_0_0_1_0_U" date stamped 12 June 2013" shows the issue with context menu's for Sketchup 2013 Pro.
I just purchased Renditioner V3 Pro and have spent the last two days trying to figure this out, reinstalling, removing plugins.... searching forums...This is the only place that I have found an answer in a completely unrelated topic.
Please support, update the download email for your purchase and the version. Or, if I have downloaded the correct version, as shown above, then the problem has returned. I can't make sense of the version numbers, but this topic is later than that timestamp, so assuming this new fixed version "11_A" has never made it's way into the official download area.
Also, when speaking to your online support guy, asking him about the lack of context menu's, (who I had to wait an hour for), his reply was that you do not support Sketchup... and that it is Trimble I need to talk to... just ranting now, but I spent money to buy this product and it's frustrating receiving such a response.