More comments.....
So been fooling around again with the driver selection and have additional feedback;
The "new" driver 48 (756ProII) that I reported did work only when the rigs were powered off prior to launching logic isn't actually correct.
The rig window works, well, it "looks" like it does as it reads the rig frequency fine, so when I spin the knob its tracking with the rigs main vfo. I can change modes, filters, split, dual watch all from logic just fine, but not all those work when changing from the radio, like I cant change the rigs freq from logic, also the rig window radio buttons for split, dual watch and vfo don't depress when changing those from the rig, the filters and the modes do depress when changing from the rig, I don't remember if they ever did actually, maybe they don't work that way. Next I noticed that the spot log features of setting the rigs frequency doesn't work, the mode will change, not the frequency. So I guess the new driver doesn't work. I also tried this afternoon driver 46, and that acted the same way. All these attempts were with only one rig enabled, the other rig was disabled in logic. This time (2) stop bits worked, go figure. Maybe it is the SIIG, too many weird things happening.
I reverted back to the legacy 20 driver, I can change frequency, mode, no problem either from logic or from the rig. The spot log set rig works. So really seems to be the only one that does work. But, logics radio buttons for VFO A and B don't change (depress) in logic when I change from the rig, nor do the split or dual watch radio buttons. From logic they work fine and change the rig. If in logic I switch from VFO A to B, the freq changes in the rig window display but the rig doesn't make that VFO the active one, its still sitting on VFO A.
So the "working" set-up is now configured as;
SIIG (4) port RS-232 Serial Card, set-up as Com 3 thru Com 6.
Icom CI-V on COM 3
Rig (1) IC-756ProII, Driver #20, 9600-2, Com 3, CI-V Transceive ON, No Polling
Rig (2) IC-746Pro, Driver #24, 9600-2, Com 3, CI-V Transceive OFF, No Polling
Rotor (1) Hygain DCU-3 on Com 4, Hygain DCU1 Driver, 4800-1
Both rigs powered on prior to launching logic, both are enabled in logic, logic loads, both rig windows display, work, and I can shut down and re-launch without any complaints from windows. I did get one error window when changing rig 1's freq in logic, spinning my mouse wheel pretty fast (it has a switch allowing it to freely spin) then changing the vfo back n forth from a to b, then a couple other switches of mode, logic complained with a pop-up saying Retry Count passed limit of 20. I guess it disables both rig control windows as the freq display went to 0.0000 on both and all control was non-functioning.
Not sure this is providing any help. I would like to know of any others running with a CI-V and multiple Icom rigs just to compare set-ups.
Thanks for being an "ear".....73