Discoteque of Doom Help - again

[dlcatftwin]

Greetings all, again (and Ryos, hi again),

I followed Ryos' instructions and they worked like a charm getting out of room 20505.
Now I find myself stuck elsewhere, closer to the destination but still afar off.
I am now in room 20310, with the four squares. I am in the lower left square, having fallen off the

M/M

block.
Jack can't get out; please tell me this is not a glitch, and there's some trick move to get back in action.  :-?
Many thanks,
DLC