Snap to path intersection often fails

[pRototype]

Hi

OS: Windows XP sp3
Inkscape 0.48+devel r11515

When snapping a guide to a path intersection (in this case, a line over a circle) I have observed the following behaviours when hovering a guides origin over a path intersection:
1: Snaps correctly to intersection point. This is the most common behaviour.
2: It doesn't snap at all. In this case, I'll get it to snap in the other intersection (the other point where the line and circle intersect). If I move the circle below (eg. hit End key to put the object all back) then the snapping suddenly works again.
3: Wrong place to snap. This is the case in the file I attach.

Because of pt 1, the symptom can be hard to reproduce. I had to try five times to manage to provoke the behaviour described in pt 3.
I was not able to reproduce behaviour in pt 2 a second time.

I think the problem gets worse if the number of guides increases.

Thanks

[su_v (suv-lp)]

Probably (needs verification) related to Bug #847457, comment #3-4:
<https://bugs.launchpad.net/inkscape/+bug/847457/comments/3>

[pRototype (regeir)]

Update.

I'm now running Inkscape 0.48+devel r12093 (will later on unpack r12104) and I observe the following when I trying to snap between a line segment and a elipse, trying to place a guide at intersection between elipse and line segment:

*1 When the line is straight, I have no problems getting the guide to snap to intersection.
*2 When the line is not straight, then I won't get the guide to snap to intersection.
*3 Test on a new drawing, only consist two elipses: I cannot get the guides to snap onto the intersections of the elipses. But, the guides snaps at right side at both elipses, and claims* that is the intersection point. I'll provide a sample file for this.

* the test that occurs near snapping point when snapping takes places.

Maybe I should open a new bug repport for *3?

[Beluga (buovjaga)]

Still repro with example file in that it offers both a correct and incorrect position as the path intersection.

Arch Linux 64-bit, KDE Plasma 5
Inkscape 0.92pre1 15073 (GTK3)