Photo shoot is now complete and I can get back to this problem. I received this response from 10u via their forum. My guess is that they are trying to narrow down where the problem is coming from with the new firmware update and new mount log:
Dear all,
the new firmware version 2.14.8 beta, used with the new mount logger version 2.7, logs additional information that will be useful to diagnose (and hopefully solve) the issue with the "Lock clutches" message (in conjunction with SGP or not).
You can download the firmware here, and the new mount logger here.
[EDIT]
Just some notes: Use BOTH the new firmware (2.14.8 beta) and the new mount logger (2.7), otherwise not all information will be logged. If you can, please note the time when you see the message, so we can cross check with the log. Also, if you have other software running, try to keep only the software which is required to trigger the issue (so: if the "Lock clutches" message appears with no software running apart from the mount logger, please try to log it in that condition. If SGP is required for making the message appear, keep only SGP connected to the mount, and so on. Additional logs taken with SGP or whatever other software is running are welcome).
Thanks to everybody for the patience!
Filippo Riccio
sviluppatore software 10micron
10micron software developer
In the meanwhile, I have tried updating the UTC file and am using a new timing scheme, ie. I have turned off the Per Frejvall time sync option in his driver and now only use the 10u clock sync program. The first step is to sync the pc clock with an NTP server, then connect the mount and 10u clock sync program. Once the 10u clock sync program shows both clocks in sync, I then disconnect the NTP server so that only the 10u program is running. Hopefully, this will solve the problem as I have only used it successfully last night. If subsequent imaging sessions show that this is not the solution, I will upload the new firmware and log.
I've been contacted on this issue, so I thought it would be wise to let interested parties know the latest...........Gunny