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PSP X3 freezes with large images despite free memory

PSP X3 freezes with large images despite free memory

(OP)
I'm trying to combine three pictures.  There is some overlap among them, but I need to shrink and rotate them to make the common elements match up.  I took the middle picture, expanded the canvas size, and then tried to fit the next picture to it using a new layer.  The problem I'm having is that PP X3 allows me to move the 2nd picture only once, but then when I go to move it again, it freezes.
I've provided information that might be relevant, and if more is needed, I'll do so.  I apologize if some of it is irrelevant.
The pictures are large—the first one with the expanded canvas is 130MB, and the 2nd one is 30MB.  But I have a quadcore  CPU, with 8GB Ram, and am using Win 7 Home Premium, which is supposed to allow me to access 8 GB.  
In the interest of saving memory, I turned off History.  When I load the first largest image, Resource Monitor initially shows 15% Physical Memory usage, which then settles down to 12%.  When I open the 2nd image, copy it, close it, and load it as another layer on the first image, Memory usage goes to 24%.  When I move this layer once, CPU usage spikes at 31%, and then drops down to 2%, and physical memory use is at 30%.  When I try to move the layer again, CPU spikes to 25%, and then, after about 30 seconds, drops to 2%.  Memory jumps to 30%.  PSP appears to freeze—the layer does not move, and first there is the cross arrows of the Pick tool, but then it turns to a red circle with a diagonal line.  Eventually, I have to close down PSP with Task Manager.
Why won't PSP allow me to move the 2nd layer more than once?  What can I do to overcome this, short of reducing the picture size?
TIA.
 

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