DescentBB

Virtually every time I come on here I have to log in, even if I checked "Remember me" a couple hours earlier. Leaving the site logs me off, ignoring the checkbox. This has been happening for at least a month now.

The most likely causes are:
1) Your board cookies are corrupt in which case use this handy built in utility to delete them: click and or delete them manually if that doesn't work, then restart the browser and try again.
2) Your browser is not accepting cookies at all, for example if you enabled private browsing or you configured your browser to purge cookies on shutdown or installed some other over aggressive privacy/tracking protection/security extension in your browser or OS. In which case you have to either disable the offending extension, or whitelist descentbb.net, or restore the browser setting back.
3) You aren't using HTTPS in your descentbb.net bookmark, the cookie is setup to only work on the secure site so update your bookmark.