The "flash" is a normal part of DirectRT functioning as DirectRT ends one trial row of the input file and prepares to present the subsequent trial row. You can try setting the background color of the first row of your styles.drt to the same background as your trials to see what this does about the "flash."
Take a look at the attached file and let me know if that is what you had in mind when you wanted to "get rid of the flash"
The jump and skip features can only move to rows of the input file that come after the request for jumping or skipping; it cannot move backwards into the input file to trials that have already been presented.
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