I’ve edited the title and description of a page but cannot save the changes.
Another idea would be to clear your cache and cookies. That helps me with weird issues sometimes.
What is the text that you are trying to enter, maybe it contains some values that are considered security risks.
I tried that and it doesn’t seem to be working. Any other suggestions?
Try logging out and re-logging in. I just tested it on one of my sandbox surveys and everything is working just fine. Some times the system logs you out if you were inactive but there is not a good indication that this has happened.