Maybe related to https://drupal.org/node/2141743 ?
When the browser is smaller in height, it does not occur. Changing the "Dynamically position Save button" configuration does not help.

CommentFileSizeAuthor
button-disappear.gif1.55 MBthomasLausZ
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greenSkin’s picture

Status: Active » Fixed

Please try the new alpha2 release; it contains improvements relating to this issue.

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.