How to Change Refresh Rate

[Fiona]

Hi,
I've been running QLC+ for 2 years now very successfully in our theatre.

However, I'm now getting flickering when try to run DMX addresses higher than 250.

I think I should experiment with refresh rates, but I don't understand the instructions in the QLC+ help.
I'm quite happy in principle using regedit to modify the registry but I simply can't find the parameters.

I'm running QLC+ 4.12.1 on Win7 64bit.

All I can find is qlcplus.exe under HKEY_CLASSES_ROOT but there doesn't seem to be anything editable there.

Can anyone tell me where (the specific folder and file) in the Win7 Registry is that I can edit to change the refresh rate.
Any help would be greatly appreciated.
Thank you.

[janosvitok]

What is your hardware?

Computer: (processor, RAM)
DMX adapter: (make/model)