Trimble Business Center

I know I've had this before in the past but it was never as persistent as it is for one of my CAD techs. There is this one PDF from another job that occasionally shows up in his current job as the actual PDF even though it wasn't georeferenced. I believe it only happens if he zooms in real far. There's no way to get rid of it to see the actual PDF. This probably has something to do with the fact that we name all our PDFs the same name when we import them (after we extract just what we need). It hasn't been a problem until this job, and maybe one a couple years back that I can't remember. 

Such a crazy problem lol

I've seen this before a few years back too.  We use a jpg file saved from google earth as a georeferenced background in our takeoff files and it was always named site.jpg.  We started having other site backgrounds showing up in our takeoffs and the only remedy was to completely remove the jpg file, import and georeference again.   I want to say we scrubbed our template file a little better, cleaned out our temporary file folder on our workstations and started naming the jpg file a unique name after the project and it stopped happening.    I never figured out how TBC would pick the one it referenced as there were multiple to choose from.  We were just glad the pdf files didn't have the same problem.  Makes you wonder what other items bleed thru from project to project and you don't see or catch it.  

I have this issue with the background map, not sure if it's the same issue as what you're describing but if I turn the background map on then toggle it off, it will show up randomly when zooming in and out or when importing files. It goes away after zooming in and out a bit.