Here is the sequence logo predicted by the SAM server:

H = helix
E = sheet
C = loop (or coil)

The taller the letter at each position, the higher the probability of that specific secondary structure for that amino acid.

The above predictions are already on the starting model (based on the horizontal lines in the above figure).

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If you are a new Foldit player, please make sure you have completed all these tutorials before trying this puzzle:
- lonely sheets,
- lock and lower,
- rebuild,
- structure and rebuild,
- control over clashing.

When you start Foldit the high wiggle power is enabled, and you can enable it. The option disappears, but Foldit remains running with the high mode on.
Sometimes in Windows, always in Linux, only when you start the client.

The bug is always on Windows too
I have tested it with 864 and 867 (my current score is not valid, it's with high enabled)