Pressing X while in the move function to set a picot point sometimes* breaks the Right Ctrl Delete function.
The only way to recover the R Ctrl Del function is to restart FlowScape.
The X (set pivot point) does nothing more the move the cursor and not change the pivot point.
It also appears to disable the move, etc. functions for smoke.
On a side note, selecting the Move function sometimes disables the Alt Orbit function while in the Move function .
* Edit: Apparently there are only two pivot points. Centre and bottom. Not set a pivot point.
This works reasonably well for well defined objects, but smoke seems to be special. You can pivot smoke, but not scale it.
Pivoting smoke 90° and scaling it in the X/Y direction to give the appearance of a smoldering grass fire does not work very well.
The smoke seems to disappear..