Oh, now I think I understand why I was lost at first! You call the RRC boxes "modems". I never think of them as modems, so I did not understand what you wrote at all, hehe! Back to topic:
On the PC which already had v1.10 of the Setup Manager installed, did you uninstall v1.10 manually prior to installing v1.13?
But since you experience the same behavior on both PCs there must be something strange either with v1.13 or the RRC you used. So far I haven't heard from someone else having this kind of problem, and for me it has worked OK. You could try the other RRC too, by just connecting it and see if you can get soft/hard-ware version you could tell if it behaves alike. It is highly unlikely, almost impossible, that it will be damaged by that. I will try 2.41 and 1.13 at work too.