On my 64bit machine 3.0 has been working well. I have an epub with a about a hundred files in it and creating new files automatically drops them at the bottom but I actually need them at the top of the toc. So I drag them up to were I want them. The first indication that there is an issue is that it shows a blank entry with no name but appears to move it.
I then save the epub so that it hopefully will save the changes then I close out Sigil and then reopen it and open the epub I just saved. The entry still shows at the bottom and is not moved at all.
Now if I move it and then try to right click on it just to rename or whatever it immediately crashed the app back to the desktop.
I'm willing to help test this.
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