[A] In Discover 64-bit, my MRR raster grid is not listed/recognized by Discover tools
Solution
Most tools support MRR files, and some will allow Field/Band selection (as ER Mapper and other formats are multibanded). If you cannot select a MRR gird file it is not yet supported in that particular tool. If you cannot select a Band to use, it will use the first field/band.
If you need to convert a MRR to a standard format, that 3rd party programs support, use the RASTER>Operations>Convert tool.
[B] In Discover 64-bit, I cannot change the color display of my grid in RASTER (for a grid created in Discover's old Surfaces module or open by Grid Image)
Issue:
None of the RASTER>Display options work, such as Color, Color Stretch, or Hill Shade. Or in Discover 2017 and later, the SURFACES>Display options do not work.
Solution:
In Discover 2017, simply use the SURFACES>Display>Grid Toggle option to switch between using Surfaces or Raster colouring options. The 2 modes have different icons in the Explorer layer -
Raster Image -
Legacy Grid Image -
or
You will now be able to apply the RASTER>Display options to this raster grid.
[C] In MapInfo Discover 32-bit, a 'Raster engine was unable to recognize image file format' error is shown when trying to open a grid created or modified by RASTER (in MapInfo Discover 64-bit).
Solution
Use the same solution as [B], the SURFACES>Display>Grid Toggle option before opening in 32-bit.
If it is a MRR file, it will need to be converted first using RASTER>Operations>Convert. Then use grid toggle.
[D] In MapInfo Pro Raster, what is the equivalent of the Surfaces tool?:
Grid Query > Select by Value (greater than a value)
1/. Use RASTER>Operations>Contour
2/. Set Contour Type to <Region>
3/. Set Method to <Fixed Intervals>
4/. Press the Intervals button, and set both the Minimum and Maximum entries to the desired Value
5/. Press OK.
Assign Values from Grid
MapInfo Pro Raster provides this functionality as 3 enhanced tools specific to the vector type under RASTER>Operations:
- Point Inspect 
- Line Stats 
- Region Stats 
