Here is another one. Run AUDIT (you may not see any errors) and then keep using ED command for editing of text.
We are having this same problem. But have noticed MTEXT does not behave like this. Hopefully there will be a patch soon for this. I am getting tired of running the AUDIT command 100 tmes a day!
The city engineering team that I work for is also having the same text problem. As suggested, we tried the dtexted = 1 command and it gave us a dialog box for text entry. Unfortunately it would not retain the changes.
When we open the properties window and try to change the text we get a dialog box with the following message: "Object was open for read".
The only work around to break out of the open for read mode appears to be Audit.
This is getting extremely frustrating and really slows productivity. Please Autodesk give us a hot fix!
I'm having the same problem, and can reproduce it on two separate computers (one workstation, one laptop).
It appears if you copy a piece of DTEXT, then text edit the original piece of text, it will get "stuck". You can't edit it again, and if you MOVE or ROTATE it dissappears until a regen. Audit, or close/reopen fixes it temporarily.
I guess switching to Mtext will fix it, but I don't like Mtext for everything.