When I attach certain raster files in MicroStation V8i and then close and re-open the file my raster attachments no longer appear in the view and in raster manager the attachments have turned red.
Go into Workspace > Preference > Raster Manager >Memory
Change setting from Automatic to Standard.
In Raster Manager go to Settings > Cache Manager
Click View File. Look to see if you have a file name that contains the raster image name and has a file extension of .CTIFF.
Exit MicroStation and go to the folder that was shown in Raster Manager > Settings > Cache Manager > View File
Delete the .CTIFF file if it exist.
Go back into MicroStation. It will be slow displaying the raster images because it is recreating the raster image cache file (.CTIFF.) The raster image files should display faster the next time you go into the dgn file.