Somebody changed the Type 8 PBR grass texture. My result was all my routes (I like 8 PBR *) opened as graphic disasters. My reaction was a database issue. I could find nothing suspicious and, at the time did not suspect PBR Grass 8. So I saw both TRS19 & 22 with large areas of blank texture. Spent considerable time messing up my routes, convinced it was the database. While looking at a database listing I fortunately noticed that PBR grass8 was in-error. Aha. Fixed that and my textures reappeared. Most of the day wasted. 
