I have a dual-monitor setup with the docker fully maximised on the second screen.
When I click somewhere in the docker, the Render dialog disappears behind it and Reaper becomes irresponsive (because it's waiting for an entry and the dialog is focused). Same with Preferences dialog (maybe others as well, didn't check)
First times this happened I thought Reaper crashed. Only way to get the dialog back to front is 'Alt + Tab'. (The 'always on top' pin for the docker is not set.)
Short licecap:
http://i1100.photobucket.com/albums/...ehindmixer.gif
Win XP32 SP3, Reaper 4.30, Geforce G210