Description
The TeX \vskip command injects vertical space into a document.
Avoid using \vskip in ConTeXt.
The \blank subsystem can deal with many spacing-related issues that \vskip cannot address. The command retains information about what happened before (and might happen next); bare \vskips interfere with this mechanism.
Consequently, spacing problems related to \vskip are likely resolved by using \blank.
See Also
Use \blank.