I have been using the Audacity 3.0 RC5 since yesterday.
(Windows 10 x64 here, Audacity RC instaled in the a different folder than Audacity stable.)
I've have had one little problem, which could be a bug, and I didn't see it listed in the dynamic bugs list I saw.
Summary of the problem:
If we do something in Audacity (open or record any audio...) and save the project (.aup3) with accented characters in the filename (for example, "02-14 Marcos, o moço valente da Groelândia", without quotes, or simply "lá lê", without quotes), it saves 2 files (one in normal size, with the correct name, and other less than 1 MB, with corrupted characters instead of the accented).
When trying to open any of them, gives error and does not open the file: window "File Error -> Audacity failed to read a file in C:.". If we remove the accented characters of the filename before opening, it says in a window: "Project Recovered -> This project was not saved properly the last time Audacity ran. It has been recovered to the last snapshot, but you must save it to preserve its contents.", but opens the file.
So, the suggestion is the new Audacity could accept accented filenames, if possible.
Long description (unnecessary to read if the summary is correct as general report):
-I thought the problem was with importing from 2.4.2 and saving in the new format-
I used it to continue the work in an audio I was already working in Audacity 2.4.2. It was a story read from a book (12 min audio), which I finished recording in the stable version, and then, in 3.0 RC, I adeed music. When I Saved As the project, there was no progress bar and it didn't save, so, I tried to save with other name and in other folder, Desktop. Again, there was no progress bar, but soon after the .aup3 file was in the Desktop. Unfortunately, it was broken (does not open). I've got 2 files (238MB and 320 KB), and here they are if useful to detect why the problem.
Audacity 2 file: https://www.dropbox.com/s/snla7646nfve5 ... e.zip?dl=0
Audacity 3 file: https://www.dropbox.com/s/4l02905tgp4a9 ... d.zip?dl=0
Error when opening: window "File Error -> Audacity failed to read a file in C:."
The file name have accented words, so I tried to remove them directly in the saved .aup3, and then it opened. Seems ok, but there is the warning when opening: window "Project Recovered -> This project was not saved properly the last time Audacity ran. It has been recovered to the last snapshot, but you must save it to preserve its contents."