Today received already damaged files with identical issue from 2 different sites. Both files has lost default model which can be recovered by replacing file header. Only similarity between sites is that both have PowerCivil for Baltics v8i(latest version .878) and Powerdraft v8i also files were edited on network locations at first with PowerCivil and then Powerdraft. "Compress on exit" option is not enabled.
I could send those files to secure location for review.