Due to continual spamming, forum registrations are now by Invitation Only. Hopefully this will be only a temporary measure to combat spammers.
If you want an invitation contact forumapplication @ camstudio . org
Sorry for the inconvenience.
Best way to select a region - Fixed Region
It is best to use the "Fixed Region" menu item, un-tick the 'top-left" checkbox, hit the "Select" button and make your selection, then re-tick the "top-left" check box if you want that location remembered, then adjust the width and height to be even numbers so that all codecs work with it. 864x480, 1280x720 and 1920x1080 are the universal standards, but you do not have to adhere to those sizes. YouTube likes those best, though.