Hi Mike,

These bonds have bond order zero. Incentive PyMOL 1.8 renders those as dashed 
lines and sticks. Previous versions of PyMOL had no proper support for 
zero-order bonds, they did render as solid lines, but had no stick 
representation.

You can set all bond orders to 1 with:
PyMOL>valence 1, *, *

Or PyMOL can guess the bond orders for you, if double bonds matter:
PyMOL>valence guess, *, *

I will look into the amber topology loading code to see if we are importing 
those bonds wrong.

Cheers,
  Thomas

On 01 Feb 2016, at 07:08, Michael F. Summers <summ...@umbc.edu> wrote:

> Colleagues,
> 
> When I load an amber topology file and associated trajectory file, the lines 
> for all heteroatoms are drawn as dashed lines (but bonds to hydrogens drawn 
> as solid lines).
> I can’t seem to find a flag that would turn this feature off… I’d rather see 
> all bonded atoms connected as solid lines.  I couldn’t find an explanation on 
> the WIKI (earlier versions of pymol didn’t behave this way).  Everything else 
> works fine (movie plays as it normally would).  Any advice would be 
> appreciated.
> 
> Thanks,
> 
> Mike

-- 
Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.


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