scraping session tree disappear

I'm running scraping session from command line.
But sometimes, scraping session stops soon after start, leaving the error message "Scraping session finished.".
Then I go check at screen scraper to find scraping session tree disappeared.

Does anyone have same problem?

scraping session tree disappear

I also tried to reproduce this problem but outcome is not always consistent.

What I tried was:
1.Run scraping session from command line.
2.Then open screen-scraper GUI while command line is running
3.Make changes to scraping session and save it and close screen-scraper GUI.
4.Again open screen-scraper GUI to find scraping session disapear.

scraping session tree disappear

I have seen this lately, as well. I am investigating to try and come up with a predictive pattern and reproducability. We're using SOAP and the import folder to update scrapes a lot, if that's any help..