Hello,
There seems to be a bug in RTL documents when \framed goes in \leftaligned, \midaligned, or \rightaligned AND corner=round option is used. (I don't know what other options trigger the bug.)
Here is the MWE (verified in ConTeXt ver: 2016.01.18 22:21 MKIV beta fmt: 2016.1.19 int: english/english):
\setupalign[r2l]
\starttext
\midaligned
\framed[corner=round,
width=.5\hsize]
{Hello! This is some sample text.}
\stoptext
It works fine when either corner or midaligned is dropped. With both in, however, the frame appears to the right of the text (no overlap).
Thanks!
—MHB