At 25/05/06 09:42, Laurie Biddulph wrote:
>But the Mechanical Layer 1 doesn't have anything to do with 
>component footprints! I don't use Mechanical Layer 1 for anything 
>other than adding physical board information. Having removed 
>Mechanical Layer 1 the board works fine, positions correctly on 
>printouts and also on the screen (it would never fill the available 
>window). The problem is something to do with a `thing' existing on 
>Mechanical Layer 1. If it had been locked to a component then surely 
>I would have now lost that component or have an error with it given 
>that I told protel to delete that layer and anything on it.
<BIG snip>

My EUR 0.02:

I don't know if these things still exist in the version Laurie is 
using, but in P98SEsp6 it is possible to have a zero-length segment 
of track. Invisible, even when selected, but they can still get 
selected by drawing a selection window or by global edits.
They are usually -inadvertedly- created by moving an endpoint onto 
another endpoint of the same track. Lock and netname properties of 
these objects still apply, as may do other properties.
After some testing I found that it is also possible to create nearly 
invisible (just one pixel wide at any zoom factor) arcs or strings, 
using zero or negative trackwidth.
Also, adding the .Legend special string influences the place where 
your preview ends up on the page, depending on the number of 
different holes you use; even when the legend only displays on another page.

Last but not(?) least it could have been a freak bit error that 
changed a coordinate into the negative realm, I found the program's 
behaviour then erratic at best...

Leo 


 
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