I did run some Ralph WU's on a 5.2.13 Boinc Client and they finished fine.

ALL of my RALPH testing was BOINC 5.2.13, no problems. 5.2.13 is still the recommended Windows version. The reccomendation was to go up to BOINC 5.3.28 if you were encountering the stuck at 1% problem. I have not encountered them and so didn't go up. So I'd hope much of the Ralph testing was performed on the same BOINC version (5.2.13) that most Rosetta users have installed. If that's not what happened, I'd suggest test plan needs review.

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