I have just started testing 1.2RC2 on a recently clean installed Win7 64-bit pro system, running Lazarus 32 bit version - so far a plain single default install without any additions. One issue that I encountered, which may, or may not be a Lazarus problem is running it on a secondary monitor (extended desktop), where I use a third party open source program to get a task bar on the secondary monitor:
http://sourceforge.net/projects/dualmonitortb/Everything is fine until after I minimize Lazarus. On maximizing it, the Lazarus IDE window with the menu bar is gone; there are a number of icons in the second monitor taskbar for the other windows which work switching to, but I cannot get the main IDE window back when clicking it's icon. If I right click the icon, and click the Lazarus IDE link, it just opens a new instance of Lazarus on the primary display. If I instead close the dualmonitor program by right clicking it, Lazarus returns back to normal with its single taskbar icon on the primary display, and the IDE window restored on the secondary display as before minimizing it.
Again, I am not sure this is specific to 1.2RC2 or even a Lazarus fault, but I thought I would report it in case it could lead to some useful insight, as one other program (Nikon Capture NX2) I am running that also is based on multiple undocked/docked windows within the program behave OK with the dualmonitor taskbar. (I do not use the docking solution for Lazarus yet, as last time I tested it about a year ago, it did not work very well for me).
Edit: I did a temporary re-install of v. 1.0.14 and the same issue exists there.