Thank you very much for sorting this out, I have actually found and fixed the issue!
It was an issue with the search, an unkown bug. I had a guess that it might have been something to do with a multisite specific setup, and I was right. It should be working now.
I will make sure to integrate this solution to the upcoming release, so you won't have to worry about it anymore.Best,
If you like my products, don't forget to rate them on codecanyon :)