I have spent the afternoon attempting to reproduce what you are seeing on my Windows 7 development machine, and I haven't been able to do so. I have some questions and a request.
One of your postings contains the following Log fragment:
11:34:06.038: Exception: CmdZWaveEnableSuc is not implemented in the Z-Wave Device
11:34:06.356: SecurityManager.Init 60 24 38 46 16 50 74 C4 80 D9 10 A8 30 5B 90 08
That looks like nothing in the Engen log. Where did it come from? Is it possible you have some other Z-Stick software installed that might be interfering with Engen?
Since you are using the AEON IMA Tool, I'm guessing you are using the AEON Model ZW090-A stick, advertised as the Gen5 Z-Stick. Is that correct?
Have you made sure that you are not trying to use the IMA Tools and Engen at the same time? A serial port is an exclusive access device. Only one program can use it at the same time.
You must have the right driver installed, or the IMA Tools would not work. I'm using a COM port driver that Windows calls: Sigma Designs, 6/10/2013 0.0.4.0. What are you using?
When you have had trouble, have you considered powering off your computer, letting it sit for 10 seconds, then powering back up again? The Z-Sticks do get hung sometimes, and for me a power cycle with a 10 second wait always seems to clear them.
Could you please clear all the log files in the Engen log directory (there can be 4 of them) then power cycle and attempt to bring up Engen? The logs show the progress of the Z-Stick driver when it is trying to find the COM port where the Z-Stick resides, then again when it attempts to use the device. Please uninstall or disable any other software that might access the Z-Stick before doing this. Also do not attempt to use the AEON IMA tool. I suggest you try this a couple times, until it starts working, or you get a consistent looking failure in the log files. If failures continue, please post the logs here.
Thanks for your efforts and your patience while we work to resolve this issue.
Gene