@GadgetMaster
That's exactly what I had done, but it doesn't work here (just shrinking does).
Tried with Firefox 2.0.0.20 on Windows ME as well as with Sputnik on MorphOS.
Therefore I thought some qualifier (like shift or ctrl kept pressed while moving) might be needed maybe, but that's obviously not the case either.
You are right you don't need any key combination pressed. Just clicking on the title bar of any block in when in 'edit mode' should allow you to drag it into a predefined area marked with dashed lines. (options available = left, right or centre)
AFAIK this type of layout interface uses DHTML. It may be an issue with your javascript settings on the firefox side at least.
(You use WinME :nervous:)
Try it on someone else's PC if possible.