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That is a light Qt 4.3 version mismatch somewhere. Now that you are not afraid of technalities, open up src/qtractorMainForm.cpp in your beloved editor, and change
line 232, and around where it reads:

  #if QT_VERSION >= 0x040300
	m_pTempoSpinBox->setKeyboardTracking(false);
  #endif

change it to:

  #if QT_VERSION >= 0x040301
	m_pTempoSpinBox->setKeyboardTracking(false);
  #endif

or, just get rid of the #if/endif block if you like :)

btw, what Qt4 version is delivered in kunbuntu nowadays?
--
rncbc aka Rui Nuno Capela