Normally annotations are represented in the Browser in black font. However if an annotation is invalid it displays in red font. Invalid annotations can result from various issues including:
The simulation results were deleted, possibly by selecting the Simulation ribbon in the Configuration group.button on the
The chosen dataset contains no data item that matches the configuration of the annotation. For example, a frequency was chosen for a field annotation for which no field results were generated in the simulation. Thus the field data is absent from the dataset and cannot be annotated.
The best resolution to an invalid annotations is often to change the data source parameters or to reconfigure and rerun the simulation to produce the data you are interested in annotating.