The release notes for V1.58 state that the problem of the PLM freezing up was found and it seems having to do with mixing Insteon and X10 commands in rapid succession. That would explain why it has been working for me since I had spread the timers 1 minute apart.
It states that PLM version 75 fixes the problem. Is this a software that can be updated or is it a hardware revision? How do I determine my PLM version?
Thanks
Dan