This is really bad. It's happened to me three times already. I am using a Mac and working on Chrome.
In a text module, if I want to copy something and paste it in, the ENTIRE MODULE is erased. Gone. A lot of work down the drain.
At first, I didn't know what happened.
The second, I realized that cmd-V just erased the paragraph of new text in my module. So, I finished the module, saved it and tried cmd-V again.
The third, it erased my entire saved module.
This makes me extremely unhappy!