Cbyrdtopper,
We have been running V3390 in Dev and since its Production release.
We have not homed this version so we cannot advise if you have an issue, however prior Dev versions and V3233 worked OK.
There is no issue with the spindle on V3390 each machining process has worked fine to start, set the speed and stop the spindle.
We have been machining on our Mill from roughing to finishing cuts lasting over 12 hours per run.
The only issue which has come up is it sometimes produces a Buffer Mismatch, but this was more prominent on prior versions.
We have been provided with a fix for this and are waiting for a machining period to try it.
V3233 had a lot of bugs, so I would stick to V3390.
Regards,
Mauri.