Others have noted...

FAA initial report:

IDENTIFICATION
Regis#: 747JN Make/Model: 4M Description: SCHEMP-HIRTH
NIMBUS-4M
Date: 05/04/2008 Time: 2122

Event Type: Accident Highest Injury: Minor Mid Air: N
Missing: N
Damage: Substantial

LOCATION
City: EPHRATA State: WA Country: US

DESCRIPTION
AIRCRAFT ON TAKEOFF ROLL, WING STRUCK THE PAVEMENT AND THE AIRCRAFT
CARTWHEELED, EPHRATA, WA

In somewhat of a contradiction to the FAA report, newspaper and
eyewitness accounts state that the glider was on initial climb after
takeoff and was at 40 or 50 feet when it experienced an uncontrolled
roll. Extreme deflection of the wings on impact reportedly reduced
the damage and injuries.

I think that "uncommanded" roll might be more precise than
"uncontrolled", for technical reasons.

The newspaper account said, "He noted the airport changed its
operational procedure and added obstacles on the ramp. While not the
cause, Funston said, 'It was certainly a complicating factor'."

For mental exercise, let's forget about this particular accident for a
moment and review the possiblities based on these 2 scraps of
information: uncommanded roll and new obstacles.

Good, thoughtful stuff snipped...

Where this thread has gone is - to me - an excellent example of how
*thoughtful* speculation (perhaps it is better described as
"imagination") may wisely be used to enhance one's own safety when
soaring. No need to wait for the (too often, hopelessly homogenized)
NTSB reports...

Respectfully,
Bob - no fan of off-the-wall speculation -W.