There have been some reports of folks having trouble with certain functions. Some of the forum functions require scripts on the server to run. When clicking one of these buttons, a script is activated that may be required to run in order to complete the task. For example, the Quote button, when clicked, automatically scrolls your browser window down to the reply box and inserts a quote of the post from which you clicked. A script is required for this function to work.
One user just sent me an email to say that he figured out why the Quote function wasn't working for him. He was running a "NoScript" browser extension, which was blocking the script (and other scripts here). Disabling that extension fixed the problem.
It's pretty common these days to use scripts on websites for various functions, and RPLS Today is no different.
Clicking the Reply button only scrolls you to the reply editor, so you aren't missing much there.
Clicking the Quote button should scroll you to the reply editor AND insert a quote of the respective post. If one or neither of those is happening, something is blocking those scripts from working. In a pinch, however, you could copy the text you want to quote, paste it into the reply editor, highlight that same text, then click the " icon in the editor formatting bar to manually create the quote box. Of course, that's not the desired behavior, but it is a workaround nonetheless.
"Clicking the Quote button should scroll you to the reply editor AND insert a quote of the respective post."
Not working at all. No scroll to bottom or quote inserted. The header of the dialog box does change, but nothing more.
I use Firefox, with no blocking add-ons.
To test it I installed Chrome, and it is the same.