Had this issue happen recently. If you're getting the same, hope it helps.
When attempting to open RSLogix 5000 get the following error: Error 0x8004205f, "RxE_ORIGINATING_CONNECTOR_EXISTS - A connector already exists with this name.", see attached.
Attempted a VM reboot, did not work.
Attempting opening with Studio 5000 the program file worked. The system opened the file with the correct version of RSLogix 5000.
When attempting to open RSLogix 5000 get the following error: Error 0x8004205f, "RxE_ORIGINATING_CONNECTOR_EXISTS - A connector already exists with this name.", see attached.
Attempted a VM reboot, did not work.
Attempting opening with Studio 5000 the program file worked. The system opened the file with the correct version of RSLogix 5000.