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Cura - slicing issues - first layer "sunk" into glass?

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Trying to print a 3D turbine engine. My issue is that once importing certain items into Cura, the first bottom "support" layer (provided by designer) shows as gray in cura and doesn't print. Its like the object is sunk into the glass and is omitting the very first layer. This only is happening on certain parts and I am not sure how to fix it.

When looking at the solid view, you can see that the support is clearly underneath the fans. However, when bringing it into the first layer view, it is completely omitted. Side fact, when looking underneath, the first layer is red. Not sure if this has anything to do with it.

Item I am printing: https://www.thingiverse.com/thing:1327093

Example part that doesn't want to print correctly: LPT_Stage_1_Stator_With_Supports.stl

Screenshots of what I am seeing:

1st Layer View: 5a3341981b1e6_ScreenShot2017-12-08at8_59_21PM.thumb.png.e3aa5b2969270c4d7eb0c64050641bcf.png

Solid View: 5a334198cc719_ScreenShot2017-12-08at8_59_42PM.thumb.png.d1482607b46297875296a997aea8b459.png

Underneath Solid View: 5a33419872aa9_ScreenShot2017-12-08at8_59_54PM.thumb.png.44ec239a8bdfc0c4519ed3eb55e80012.png

Thanks for anyone who is willing to help!

5a3341981b1e6_ScreenShot2017-12-08at8_59_21PM.thumb.png.e3aa5b2969270c4d7eb0c64050641bcf.png

5a334198cc719_ScreenShot2017-12-08at8_59_42PM.thumb.png.d1482607b46297875296a997aea8b459.png

5a33419872aa9_ScreenShot2017-12-08at8_59_54PM.thumb.png.44ec239a8bdfc0c4519ed3eb55e80012.png

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The file (I downloaded and checked) just needs to be raised 0.2mm in the z direction. Sometimes a model's pivot or something does let it sink below the surface. But you can raise the model up or down.

You may have to go into preferences and uncheck "Automatically drop models to the build plate" so that it will 'stick' at the desired height.

The object seems ok in every other respect.

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Yes, it's OK with z = 0.

Screenshot_2017-12-09_07-05-46.thumb.png.3ee68c819ba992daa3eb781789c5e185.png

Hmmmm, I wonder why that would be? At 0 Zed, I get this just as the OP did:

0-Z.jpg

Edit:Clearer comment.

I had to go to pos 0.2mm to get the bottom to sit on the plate and not cut any depth off the part.

Neg02mm.jpg

Which makes me wonder how accurate the software is. That is not a little discrepancy.

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