I tried for a week but I couldn't complete the reveal phase. The "reattach" button was never shown.
Then I tried again another PC which has a fast internet connection.
Everything was completed in approx 20 minutes. The reattach button was shown, too.
I used this parameters:
Host: 5.9.118.112:14265 (from the light wallet host list)
Min Weight: 14
Curl Implementation: CCurl
Light wallet