Thank you for the report. I tried to reproduce the bug on HelloWorld project. But it works well. Could you try to do the same on HelloWorld project?
The app should remember the start search row. May be in some cases it fails.
I Found a way to reproduce this consistently using the DemoProject.en-GB.
1. goto input channel table 
2. find and replace
Replace with: s_t
uncheck match whole cell.
3. the 1st time will be performed correctly
4. do the same find and replace again, Administrator app will crash.