KvanT had some system issues (SP1 not recognized as installed by Win 7, even after re-installing it, and dxdiag and the graphics drivers reporting DirectX 10, most likely due to the 'missing' SP1). They said they would email again if this problem persisted after they got the system problems sorted out, and that was the last I've heard about it.
As above, please email support with a description of the problem and a report.zip file (if you are playing the PC version) containing a save or two before this happens. I had no problem with KvanT's saves; in a save made after this happened, the characters showed up, stationary, exactly where the screenshot indicated. If you run into a situation where the characters keep walking and do not automatically reset after some time, a save made after that may be useful.
A Dropbox or Google drive link, etc, for the report would be fine, as well, since the size can be fairly large if you leave multiple saves in the zip file.
