I am using the latest build (1.5.2.336) of PT2006.
With the RC window open, if you click on the drop down menu under tools and click on "show main window", the window appears for about half a second then disappears. If you press Ctrl+f1, the software manager window opens. I noticed though that if you close and re-open RC, and then press Ctrl+f1 without clicking on the drop down menu first, the main window pops up just fine.
I haven't seen this problem posted before so I thought I would mention it.
br1229