Room 16211 (ish)

From where Jack is standing, he can climb up, but there's no place to go once up.

The clearance won't allow him to step OFF the ledge he's standing on and jump up onto the red pathway.

Tell me what I'm missing, please?

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Make that "step OFF the ledge he's standing on and jump up onto the red pathway OR back to the green blocks".

I'm just going by memory here, but I think Jack jumps up to catch a vine from where he's standing in your pic.

Yes, catch the vine!

The vine is what I was referring to when I said "he can climb up".

Climbing up the vine still gives me nowhere to go (that I've been able to suss out).

Thanks   :)

Are you talking about the vine that we can see the end off?

Keep jumping straight up,  more than once.

Did that, too.  :)  The map shows an upper vine, and I "felt" the blocks that I jumped up on. I still ended up with no place to go.

AND... I haven't been able to work my way back to that spot again. The next time I played, I got "next" to that spot, but ended up way on top of the mansion somehow.  :D It is a good and complex one.

This time through, I ran up against being blocked from proceeding. I ended up back at almost the beginning, and then couldn't proceed because the room I was in (17003) used a one-time lever that wouldn't function again.

Screenshot attached.

I'll keep plugging away.

Thanks.  :)

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Dear Mick.  When you post these pictures PLEASE don't skip the uppermost part so we can see how many keys Jack is holding and so on.
If seems to me that when you restarted the mansion you took another way from the beginning, i.e. you didn't start with the easy section.
The lever in this room only opens the red trap doors so it is a one time lever.  The problem is that somewhere before you have turned silver blocks to gold without ever turning them back.  This is my fault and I will upload a fixed version soon.
In the other room, 16211, from where Jack is standing, he is able to go straight up.  The next time you played you were in another route and thus ended at a different place in the next room.  Note that the small portion of vine just to the left of the structure is NOT accessible to Jack from where he is standing.

Both original and HD versions updated and uploaded.

Thanks, Brell.

as to the screenshots ... I sure will do that. I was trying to make the pic as small as possible.  Good intentions gone awry.

aaaand...  I still haven't found my way back to that spot yet. Next go-round I ended up NEXT to it.  ;)

I'm sure it will all work out when I finally get there.  If not, I'll come back and whine some more.