I noticed that on Asus Rampage IV Extreme, AIDA64 sometimes outputs "Thread creation error: Insufficient memory for this operation" and after that readings of OPT1, OPT3, Case 2 and PCH fans become 0.0 RPM (I have OPT2, Case 1 and Case 2 fans unconnected so cannot say anything about them). CPU fan and CPU OPT fan readings are still OK.
If I relaunch AIDA64 (File - Exit - Run again), readings become OK, and sometimes later the problem repeats.
I have to confess that I have ASUS Suite II installed (because and only because AIDA64 missed OPTx temp support on Asus R4E!). After installation of AIDA64 Beta, I stopped running it, but process explorer shows its modules loaded and running (FanControlHelper.exe etc). So this may be result of interaction of AIDA64 and ASUS' DLLs (http://forums.aida64...ndpost__p__5532). It's not a problem for me, I plan to uninstall ASUS software. Just leaving it now only to help you in testing
AIDA64 version: 2.50.2075 Beta.
P.S. Fiery, thanks a lot for your great work - from another R4E user
Never remove R4E support from AIDA64! BTW, you already have Option/Stability settings, you may add Asus Suite II compatibility there...