Wall sections not snapping together without gaps (seemless)

[RogerC]

Sometimes I can't get wall shapes to join together perfectly at their ends.
The connection point on the end of the wall shape turns red as if it has
snapped to the other wall shape, but visually there will be a gap in area
where the walls should be seemlessly joined together. If I highlight one of
these wall sections that have a gap the shape's dotted line highlight around
the outside edges of the shape will show the shape being different from what
the fill color of the shape appears as. It looks like a small corner of the
shape is broken off and missing.

 

[Philippe C.]

Is it an L - corner ?
Are the walls of different width ?
How are the refence lines ?
Is there a style applied ?

When I connect 2 walls of different width linearly, there is an interruption
in the boundary line. This is probably a good thing. So I can see that
these are two shapes. The little line nevertheless appears on print.

 

[RogerC]

It happens on both 90 degree (L) corners and corners with a different angle.
The walls are the same width and the properties are the same except for
length.
I haven't applied any styles (using Vis2007 so I don't think that's
available) or Themes.
I'm not sure what you mean by 'how are the reference lines'.

Another strange thing; if I move one of the effected walls away and snap it
to a different wall, the broken off part of the wall changes shape somewhat.
It seems to be randomly shaped. The broken part can also jump to the other
end of the wall that isn't attached to anything at all. If I drag the wall
off by itself so it isn't snapped to anything at all, it appears normal and
has four square corners. If I drag that same shape and drop it on another
wall it will be randomly shaped on at least one end.

 

[RogerC]

Correction: I see that Styles are available in Vis2007 if Developer Mode is
activated. But no, I don't have any styles applied.

I think the wall segments must be getting corrupted somehow. I deleted the
three walls that are giving me trouble and recreated them from scratch and
they are snapping together cleanly now with perfect joints.

I'd still like to know what might be causing this though because it keeps
happening (this isn't the first time).

 

[Philippe C.]

I mean are the reference lines on the inside or outside corner ?
Just to be able to reproduce the problem.
Maybe the snap and glue settings should be known also.
If it persists, put te drawing on a site, I'll have a look.
But I'm no expert.