You might try "auto hide" the toolbar but this yeilds an annoying white line at the base of my screen which can be removed by toggling windowed/full screen a couple of times.
This is not really a proper fix same with a simple mouse click on the NPVR "window" but may I ask why you shutdown your PC? Are there not recordings to be done and EPGs to load? My system is always on and one remote action kills the screen saver and I'm ready to go.
Server:ASUS F1A75-V Pro,Radeon HD 6000,AMD A6 3670K,SSD128GB,2xWD 2Tb,W7Ultx64,5.1spks,2xHaup2250-MC,ATI650,CM7777,WG HD-8800
Client:P4 3.4,ATI HD4650,W7Ult
nDroid Client:Samsung Galaxy Note(synced to previous days recordings)