Lol, true, sorry, Jafo.
You know well I don't usually do this, but Nexus *was* mentioned here as having issues with Windows 10 and I'm not doing anything Brad wouldn't do (and did previously on the Winstep - and other - forums when ObjectDock was discussed there).
So, just to wrap this up and then I'll shut up : BlackHeretic, I remember your email now.
It's not usual to have the dock overlapping the Windows taskbar (more usual is to have it above the taskbar, and that way this would not have been a problem) but that is not what was causing the issue by itself. My guess is that this has something to do with the Windows 'Show Desktop' function (WIN+D), the way Windows 8.x/10 accomplishes that and how to detect when 'Show Desktop' is active.
It's a bit technical, but basically Microsoft does not offer 3rd party applications any way to know when 'Show Desktop' is active. This is a problem, because the dock must remain visible even when 'Show Desktop' is active. In previous Windows versions, the desktop window would be brought to the foreground (thus covering the windows of all other applications) by 'moving' it into a special container window (and this is how Nexus could indirectly detect 'Show Desktop' was active) and would then be moved back to its normal place when 'Show Desktop' was no longer active.
Alas, that last part no longer happens which makes it very difficult to detect when 'Show Desktop' is no longer active (I currently do it by detecting if other top level windows are visible, which would not happen otherwise). The problem is, when 'Show Desktop' is active, the dock cannot retain its 'always on top' status or you are going to have a bunch of z-order problems. So, if you have no other open windows, the desktop is currently the foreground window (which is what happens when you click the Start button) and Nexus thinks 'Show Desktop' is still active, you are going to run into what you saw.
I acknowledge this as a real issue to which I have yet managed to find a solution, much to my frustration. Again, it would not be an issue if you weren't trying to overlap the Windows taskbar.
As for price, let me remind you that the price of ObjectDock was also $19.95 for many years (which, given the complexity of both Nexus and ObjectDock, is more than a fair price for both applications) and was only lowered to $9.95 after the last release, back in 2014. Nexus, in contrast, is still in active development and it does have a ton of features unique to it, with more being added all the time.
There, Jafo. I'll shut up now.