Replying to rogerstb@…:
Hi thanks for the reply. In fact you're quite right it didn't technically crash, however an error message box appeared this morning (although it didn't display any text within it) and the application froze.
Without relevant technical info on this error there's nothing we can do. The best I can assume is that you didn't allocate enough memory to JOSM, see InstallNotes#MicrosoftWindows and Download#VMselectiononWindowsx64 about how allocating more memory.
In the autosave folder there is also a .osm~ file (0kb) and a .pid file (1kB), but I'm worried the autosave has failed and I won't be can't recover the lost work
Maybe JOSM turned out of memory during the autosave (just a wild guess as you have a very low value):
Memory Usage: 71 MB / 247 MB (33 MB allocated, but free)
You're right, the complete data can't be recovered. The best you can do is manually edit your file, add the missing XML tag and check if you can recover some data, but be extremely careful if you go this way: the file will be corrupted anyway, a lot of data will be missing, and unexpected behaviour may occur.
I'm sorry to close again this ticket but there's nothing more we can do with the information we have.
