Your monitor probably does support 50Hz unless it is very old. Probably you graphics card is the fault or the video editing software.
There is an age thing - but I suspect it's more related to the supported interfaces. I've never come across a monitor which reports anything other than 60Hz on a VGA connector or a DVI connector, but monitors with HDMI ports tend to support 50Hz on the HDMI, though probably not 24/25/30. The oldest monitor I'm using regularly at the moment is perhaps seven or eight years old. My old Philips 17" CRT would synch at anything from about 45Hz to 120Hz, so long as the other timings added up. I had an even older Philips - Acorn-badged - that could even do 50Hz interlaced. It had a SCART socket :-)
M.
Biting the hand that feeds IT
