Comment 4 for bug 1544680

Reproduced with Inkscape 0.91 r13725 and 0.91+devel r14647 on OS X 10.7.5.

Based on tests with archived builds:
- not reproduced with rev <= 12920,
- reproduced with rev >= 12921;
the changed rendering of the path effect in Inkscape 0.91 compared to Inkscape 0.48.5 seems related to the 2geom update in r12921:
Revision 12921: update 2geom's copy to r2142
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/12921

A few other regressions exposed with the 2geom update in rev 12921 are already fixed - some of them in 0.91: bug #1272119, bug #1312333; some in trunk/0.91.x: bug #1428683, bug #1428267.

Later changes between rev 14159 and 14165 apparently cause the affected end of the path to be rendered even thinner - probably in rev 14161 "sbasis-to-bezier. avoid ill-conditioned behavior for anti-symmetric case" (for bug 1428267):
http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/14161