I'm sorry but we provide support only by e-mail or forum.
What is strange in this case, is that entries in the log file are for Arnold materials, not Corona.
Please, try this:
- Delete the PortableMatlib.log file, to be sure it doesn't include old entries.
- Create a ForestIvy object in a new fresh scene.
- Load some Ivy preset and send us the new log file, if any.