It would help if we could get a debugging log of the Perforce plugin failing. To do this, edit the custom tool configuration (Tools > Manage Custom Tools > Edit) and add a --debug argument to the argument list, and go through the steps again to reproduce the error you were seeing.
This will create a ccollab.log file in the "current working directory" which is either the Perforce install directory or the "Start in" directory specified in the Custom Tool configuration.
After running this command, do not forget to remove the --debug option from the p4v tool or commands from p4v may run slightly slower in the future.
Please send that to Technical Support and we will help you resolve your issue.
Our email address is support@smartbear.com