That's quite odd. I don't suppose you happen to have any signs in the area? In theory, they use an identical method, so you'd see something like the sign being empty when you re-enter the area.
More info that might be useful:
- Did anything special happen to those specific blocks? (portal/gravity gun comes to mind)
- Does the problem continue if you remove and re-place them?
- Have you tried placing them at the same coordinates in a different world?
Having the world itself to poke at might also help. Is it small enough that you could upload it somewhere? If not, it's possible to figure out the specific region file(s) for its coordinates, which would be much smaller.
Happens to the sign too.I know how I caused the problem. I used covert jaguar's track relayer to switch some normal rail to high speed. When I unload the chunk and come back the sign has lost its text and orientation, the rails have reverted to their original track before I had changed them to High Speed and your machine and the accelerator are oriented wrong. So it seems its loading the chunk from a "cache" and not the actual save files. When I come back to the improper chunk and save then reload it fixes everything. I'll talk to CJ about it.
edit: so it seems like its a forge bug...