Comment 6 for bug 1525418

>>I would love to see a fix for this, that fixes it for all affected extensions.
>> Perspective/Envelope extensions stopped working in 0.92 and higher :-(

could you attach an example of this, these two extensions appear to be working for me on Windows 10, Inkscape 0.92.1 r15371

as far as I know, the original bug report was fixed in :
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/15590