You know how you can leave a window open on your browser if you leave a thread and go to another, then check back in on your previous thread? I can't do that. The new thread overrides the old one. I can't have two conversations on two threads at the same time anymore.
If rebooting doesn't work, you may have to run System Restore. I had to do that just yesterday, because my word processor suddenly started showing all the formatting marks (paragraph symbols, etc.) That function was turned off, but it didn't matter. I tried turning it on, then off a few times. I rebooted. Eventually, I had to run System Restore.
No, I'm not familiar with that. My head would explode if I tried to have two conversations on two separate threads. Try clearing your Cache in the Options section. Your online memory may be full.
When you click on a link, don't use your mouse's left button. Use the right button, then select "Open Link in New Tab" or "Open Link in New Window"--whichever you prefer.