[Is there a way to lock the clock rate of the processors?]

I am running an x6500 with bfgminer 3.10.0 with bitstream "fpgaminer_x6500-overclocker-0402.bit".

Is there a way to lock the clock rate of the processors? They continue to increase by 2Mhz a minute until it bfgminer hangs with hundreds of HW errors.

When I start bfgminer, I select [M]anage devices, then [C]lock speed, 200 [Enter], then do the same for the other processor of the FPGA.

Any help would be greatly appreciated!

I just had a couple questions regarding vanity address generators and private keys.

Why would person A use a vanity address created by person B if person B knows the private key to that address? Wouldn't this defeat the whole purpose of keeping your keys secret?

Also, how safe are vanity address generators? How can I trust that the developer will not steal my coins?