Hi,
When you cross 360 degrees, some projections have difficulty dealing with that. 
 Try not crossing that or try splitting the shapes that cross it.
Nicolas

> Le 16 déc. 2019 à 22:32, Lee Eddington <[email protected]> a écrit :
> 
> I’m not sure that’s the reason as I have plenty of points in my lines.  
> Also, I saved the densified layer to disk, but the saved layer has the same 
> display problem as the original layer.
> 
> Lee
> 
> 
>> On Dec 16, 2019, at 8:35 AM, Nicolas Cadieux <[email protected]> 
>> wrote:
>> 
>> Hi,
>> 
>> If you have a very long straight line represented by only two point, 
>> reprojection operates only on those two points (called vertices or nodes).  
>> The lines just represent a straight connections between two point.  The 
>> problem is that the earth is round (contrary to some popular belief :) and 
>> those long straight lines need to be bent depending on the projection being 
>> used.   Since reprojection and zooming only operates on vertices or nodes, 
>> densification adds nodes to the line giving more points to calculate and 
>> thus, less errors.
>> Cheer!
>> Nicolas
>> 
>> 
>> 
>>>> Le 16 déc. 2019 à 10:23, Lee Eddington <[email protected]> a écrit 
>>>> :
>>> 
>>> Hi Nicolas,
>>> 
>>> Vector densification worked.  I went with the default 1 vertices to add and 
>>> it created a new layer that now displays at any zoom level.  Can you 
>>> explain why my original layer doesn’t display?
>>> 
>>> Thanks,
>>> Lee
>>> 
>>> 
>>>> On Dec 14, 2019, at 3:13 PM, Nicolas Cadieux 
>>>> <[email protected]> wrote:
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