When we create DWF files, some of our drawings (the ones where we are drawing entities at various elevations and using clipping planes to view / move between elevations) some line work from other elevations not in the current display, appear in the DWF files.
To be specific. We have a block with a circle that has segments trimmed out and some attributes and one line. When we create DWF files (using AutoCAD 2004) the circle segments from elevations not in the current view (front and back clipping planes are set to hide other elevations) will appear at the current elevation.
We have also seen this when printing to other output methods but only in the print preview not on the actual output. Some of our clients, when sent our drawings and printing using another print driver will actully get these to appear on the output too. I assumed this had to do with the print driver until it appeared in the DWF files.
I just recreated the drawing of the block from scratch in AutoCAD2004. (The original files was a Release 14 drawing file.)
I didn't trim the circle entity this time so the segments are not arc's in this version. I inserted the new block into a new drawing then moved to another elevation and inserted it again. Then I turned on my front and back clipping planes to obscure the other elevation form view. I generated a DWF for each elevation with the clipping planes on to hide the other elevation. In both cases the circle appears in the output. All entities were drawn on layer 0.
I attached a zip file with both the DWG and DWF files.