Hi Mirek,

It seems that Progress::SetPos() 'eats' memory.

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

GUI_APP_MAIN
{
	for(int x=0;x<5;x++){
		Progress progress;
		progress.Create();
		progress.SetTotal(20000);
		for(int i=0;i<20000;i++){
			if(progress.Canceled()) break;
			progress.SetPos(i);
			progress.SetText(Format("MemoryUsedKb %d", MemoryUsedKb()));
		}
		Sleep(2000);
	}
}

Best regards,

Tom