Double-Digit Screensets

Question

These don't seem to work as indicated in the manual.
I have four screensets, all locked, they are numbers 1, 2, 3 and 4. I access them easily by simply typing the single digit number on my number-pad.
Now, for example, I would like to create screensets 12 through 13.  The manual says to use Control-# for the first digit (in this case "1"), followed by the next digit (in this case "2").  In actually doing this, though, the initial Ctl-1 brings up my locked screenset 1, then typing "2" simply takes me to screen set two.
In my case this will work if I create screenset 85.  I hit control-8, and since there is no screenset 8, it goes nowhere. Then my second "8" concludes the process by indicating "Screenset 88" at the top of the screen.  But similarly, I can't create 81, 82, 83, or 84.  If I issue ctl-8 followed by any of these numbers (1,4), it will simply return me to screensets 1 through 4.
Incidentally, despite my indication above that screensets 1 through 4 are locked, having them unlocked makes no difference.
The difficulty seems to be this, Ctl-[digit] doesn't respond by waiting for another keystroke, it goes immediately to the screenset, making double-digit screensets impossible if the initial digit has a screenset associated with it.
How about this one: Trying to create a screenset 55 I issue ctl-5, the system does nothing, as there is no screenset 5.  I then release the ctl key and issue a "4" which brings up screenset 4.  I then issue and unmodified 5 and suddenly I have a screen set 55!  It recognized the ctl-5 as an indication of a soon-to-be-whole double digit screenset, took me to screenset 4 when the keystroke was issued and then (for all intents) saved screenset 4 AS screenset 55 when I issued the next 5.
Irksome!

Answer 1

It works fine for me.
If I want screenset 11, I hold control and hit "1" twice, quickly in succession.
If I want screenset 34, I hold control and hit "3" and while still holding control hit "4", quickly in succession.
So effectively, you are holding control for both digits and thus doing a control+first digit and control+second digit.
The key is to do it quickly without releasing control, otherwise a small timeout expires and the second key press  (control+second digit) will be interpreted as a single digit screenset.
The manual says:
"For two-digit screensets, hold down the Control key while entering the first digit."
It does work like this, but often people can't release the control key and hit the second digit quickly enough. I just did some testing, and it worked as described in the manual for me, even with a significant delay entering the second digit.
But in general, just keep it held down for the second digit, and enter them quickly.
For me, under no circumstances does control-X take me to screenset X, it always does nothing until receiving the second screenset digit.
A thought: I do remember somewhere between LP7 and LP8, some of the behaviour of handling key commands changed giving some funky behaviour. If you are having problems accessing certain screensets, try removing and re-learning the screenset key command assignments, and seeing whether this improves the behaviour you see on your system.
You may also want to try trashing your preferences and control surface preferences as well.