There is a thread in the deals forum
Basically since the most recent Softube update prochannel modules are not functioning correctly and attempting to open a project with them in will cause Cakewalk to crash to the desktop.
I reported this to Softube who say in their initial response.
I have now contacted Cakewalk support with a crash dump in case they can help.
For the time being I would recommend against updating Softube products if yo use them in the Pro Channel. A