Verify that all categories used in your database have a symbol in the Theme Manager in IMSMA NG. Categories without a symbol will be '''invisible''' on the map. Adjust imsma.mxd with ArcGIS Desktop and re-import the map. Remember to rename your background map mxd for each re-import.
[[pictureImage:Upgrade_V6_Font.png|500px]]
Verify that the fonts are OK too.