Moofinseeker

It just happened again but with a different ride. I have absolutely no idea what is causing thisView image

Hi, I've been trying to do the Alcatraz scenario twice now and I'm a stickler for detail. I got the park looking all nice, but when I click on the Inverted Vertical Shuttle, then exit out without building anything, all of the pre-made rollercoasters in the menus are named "Deja Vu", the preview is invisible, there are no stats and the rides are unplaceable. The first time this happened it reverted both the autosave and my manual save to September Year 1 even though I was well into Year 3 at that point. Anyone else have this issue?