Hi I don't know if the Author of the workflow still receives notifications of this thread let alone even reply, but just recently used this workflow, it was working fine for around 30 mins then suddenly I did a search and it comes up with "No results found" then under it "I'm really sorry that you had to experience this.".
If this has happened to anyone and managed to fix it, it would be great.
I have tried removing the workflow and re-installing it but that did not seem to work.