unfortunetely ppro does not remember last opened clips in source monitor if the project was closed. It only remembers recent clips opened in current session.
also never heard of a problem like this. But it sounds like a corrupt project or corrupt prefs.
you can clean prefs and try to import the sequence to a new project. This could help.
ppro automatically generates peak files for waveform display. For several hours of footage it takes some time. If you don’t need to show audio waveforms, you can disable automatic peak file generation in preferences. Then ppro will only generate waveforms at the place you play back.
sorry, i think i misunderstood your question. In cs6 there is no shortcut for moving clips in the program monitor. In Premiere pro cc these shortcuts were added by simply using the arrow keys.
You can double click into the program viewer. This will show up the wireframe for the clip. Works well if you have only one clip at a time. If there are multiple clips stacked in multiple tracks, it becomes difficult because you always select the highest clip in order.