<off-topic>
Detail likely not really relevant to this report (bug #1425542): when repeating the steps to reproduce mentioned in comment 4 (e.g. group an object (a clone, or a text) and its blurred clone), Inkscape 0.91+devel r13950 (with or without patch) produces this console message:
<off-topic>
Detail likely not really relevant to this report (bug #1425542): when repeating the steps to reproduce mentioned in comment 4 (e.g. group an object (a clone, or a text) and its blurred clone), Inkscape 0.91+devel r13950 (with or without patch) produces this console message:
** (inkscape:62042): CRITICAL **: void SPObject: :requestModifie d(unsigned int): assertion 'this->document != NULL' failed
</off-topic>