I tested with with artificially modified project file (changed version to 5.0) it seems to work, and now this psecific warning show up depending on preferences setting/toggle. --- diff --git a/cinelerra-5.1/cinelerra/mwindow.C b/cinelerra-5.1/cinelerra/mwindow.C index 04549fde..8551c2e3 100644 --- a/cinelerra-5.1/cinelerra/mwindow.C +++ b/cinelerra-5.1/cinelerra/mwindow.C @@ -2211,8 +2211,11 @@ if(debug) printf("MWindow::load_filenames %d\n", __LINE__); if( strcmp(cin_version, CINELERRA_VERSION) && strcmp(cin_version, "Unify") && strcmp(cin_version, "5.1") ) { - eprintf(_("Warning: XML from cinelerra version %s\n" - "Session data may be incompatible."), cin_version); + char string[BCTEXTLEN]; + snprintf(string, sizeof(string), + _("Warning: XML from cinelerra version %s\n" + "Session data may be incompatible."), cin_version); + show_warning(&preferences->warn_version, string); } if( new_edl->load_xml(&xml_file, LOAD_ALL) ) { eprintf(_("Error: unable to load:\n %s"), filename); --- But I have another warning coming from plugin server (because in old CinGG plugin names were localized) Still, old Cin 5.1 project can be loaded if I insist (load it again after warning first show up) Not sure if we should consider this bug or feature .....