David is on the road and is unlikely to respond in the near future.
The cursor issue is a known issue (not unique to MXC) but the cursor should appear if you click anywhere in the reply box and start typing. (not ideal, I know, but it won't change until the forum software is next overhauled, which is not currently a high priority as most focus is on overhauling the main site software to bring it into the 21st century!)
Esperanza, can you send me a screenshot or shots (Cnt-PrintScreen; then Cnt-V [paste] into an e-mail to email@example.com) of exactly what you see so I can attempt to replicate your view to see what's going on? Thanks, Tony.
Tony, I don't know what you mean by "Cnt". ??
David, I use Firefox, latest version, and don't have any restrictive kind of anti-spam or anti-virus on my computer. My Windows firewall is at a normal setting. Tell your software person, and thanks for posting back to me from the road.