RH crashes after renaming project

[mimimicrimi]

Hello - I can't find information about this problem anywhere. I have a RH html project (locally). RH version is X502. I renamed the project with File ->Rename project.
RH renamed the project, then promptly crashed. It crashes every time I open this project with a "RH needs to close this project" type message.

I deleted the CPD file and tried again with no luck.

I had rebooted after the first crash as I thought it might be due to the fact that I'd downloaded some Windows update (corporate machine) and it was asking me to reboot but I hadn't yet. That might have caused the problem?

In any event, bad me did not back up first. And I hadn't created any output yet.
I know I can create a new project and import the files but am wondering if anyone else has experienced this.

[mimimicrimi]

Also, I did find Peter Grainge's information on "Opening Projects" and followed those steps. I did have to create the hhp file. Great info but when opening the hhp, I got the same crash.

[mimimicrimi]

OK..once more...I read more in Peter Grainge's information and I have a slew of three-pane frame files in the project..that might be the problem..more trouble than not to delete and re-add so I will create a new project.
Thank you for all that terrific information Peter!