[Gimp-user] Heal selection Errors

[jitblass <forums gimpusers com>]

Thanks.  
I tried saving as PNG (despite being concerned about file compression).  It
still yielded the same results.  If I take a small screen snipping of a swath of
the image, I am THEN able to use heal selection on THAT image.  There's
something about the tiff I'm using (and it apparently carries over when I
convert it to something else).

Again, I'm trying to keep this as high resolution as I can.

The link to an image can be found below.  It's 65MB so I was unable to attach. 
Most of the tiff files at the link below give me the error.  The one file in
question is the USA map image from the "Planning" Tab.

https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/vfr/

To Rich404's questions:
-not sure the "format" of the tiff.... I thought .tiff was the format.  I'm
sorry.  (Link above - File attached)
-Heal Selection Settings: I'm opening the file, changing image mode to RGB, then
using free form select, then using filter -> enhance -> heal selection.  These
are the only "settings" I make.  That process worked on an iphone picture.
-I'm using windows 10.  I downloaded my plugins from
http://registry.gimp.org/node/27986

Thank you so much for the help!

JT

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jitblass (via www.gimpusers.com/forums)