Did you check the project completely out of Source Control before trying to upgrade it?
We don't use RH source control, we're using Mercurial. It doesn't use a check in/check out model, but instead does merges.
But yes, I have all the files locally that I need to run the project in RH 9, and I assumed that it'd convert fine. But you gave me an idea to copy out the project into a diff folder and see if it converts there. But first I'll restart my computer on the off chance it's a memory issue or something is open that shouldn't be.
Hmm. I copied the project to a diff directory and it did convert... So maybe that's my solution if I run into conversion crashes. Maybe something in my repository directory is causing that. Who knows.
Another thing that confuses me is that sometimes during a conversion, a project updates this meta name tag in the .htm files:
<meta name="generator" content="Adobe RoboHelp 9" />
<meta name="generator" content="Adobe RoboHelp 2015" />
And sometimes it doesn't.
I'm talking about the true file when viewed within NotePad++, not RH's wonky HTML editor that sometimes matches and sometimes doesn't match reality. (In RH's HTML editor it always had the meta name tag to "Adobe RoboHelp 2015" while underneath in the real world, it's "Adoboe RoboHelp 9". How does that happen?)