Hi John,
I have just tried to do a name change on a project and I didn't have any problem. Both by renaming the P1P and "Rename Project", I will go through how I did it so we're not missing anything.
I'm using a MC_050-020 with an application called NAMECHANGE_1.P1P, in the test and this is how I did it.
Renaming P1P
1. Close to P1P.
2. Copy the P1P to a new folder
3. Rename the P1P to NAMECHANGE_2.P1P
4. Open P1P in PLUS+1 GUIDE and compile.
5. Close to P1P
You should now have a P1P and LHX file with the name NAMECHANGE_2.
Using Project Rename
1. Open NAMECHANGE_2 in PLUS+1 GUIDE
2. Open "Project Rename" in the File menu.
3. Change the name to NAMECHANGE_3.
4. Compile
5. Close to P1P
You should now have a P1P and LHX file with the name NAMECHANGE_3. But also the old LHX file, NAMECHANGE_2.LHX.
I also tried to go back by renaming it to NAMECHANGE_2 again without any problem.
If you have deleted all files in the folder from the old project, and changing back to that name, or using a new folder it shouldn't cause a problem.
Let us know if you still have the issue, then we need to look into it.