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.
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?