yes. i deleted all singularity files including appdata, etc.Did you delete the files in all the relevant AppData folders as well? (they aren't removed when you uninstall the viewer)
thanks, gaudin. i will try that fix-- altho my prim disappearance is sporatic; different pieces every time i log on. we'll see how that goes.I copied the original linkset, deleted the old one and placed the copy in the old location. It seems to be OK now