To be honest I don't know what the other two indicator lights are for on the Erg 4000 keyboard so I couldn't quickly test them - if you have a quick insight it would be appreciated.
From top to bottom (they also have matching symbols on the keys they're for):
Num Lock
Caps Lock
Scroll Lock
F Lock
Num Lock and Scroll Lock both do nothing in the Mac OS. There are no such keys on an Apple keyboard, so there is no association to those keys in the OS itself.
I don't know who people use the junk stock Apple keyboards - or any of the high end flat ones for that matter. Their wrists will suffer for it someday.
For those who have never used an ergo keyboard before, they feel very odd at first. You get so used to pulling your elbows in to your side to get your hands and wrists straight to the keyboard that you don't consciously realize how much you're straining 100% of the time to hold that position. The ergo keyboard lets you just move your hands to the keys, and they fall right under your fingers. What feels odd to new users coming from straight boards is having to remember NOT to pull in their elbows. Let them relax and your hands fall into place.
But is there a trend going on in this regard on this forum? Because people should only answer if they have specific experience with that particular issue - expecially if is referring to outside hardware or software. Do you know what I mean?
Mmm, yes. But at least the attempts are will intentioned. The obvious suggestions are to check the keyboard settings in the System Preferences and Exposé. While they may not have the keyboard, a person who does may not have thought to look there, rather than only the Microsoft Keyboard panel. There are times when I have somewhat blindly made suggestions that got the person who started the post to rethink how they were approaching the problem. While my suggestion was a bit generic, it turned on a light in their thought process and they looked where they hadn't thought to before, and fixed the problem. So sometimes even a somewhat vague response is better than none. But yes, it is always best if the person who answers can actually look at the same hardware/software.