I know how to perfectly replicate this problem every time.
Here is the guide:
- Copy any image file, or take a screenshot that goes into your clipboard (
[Windows Key + V]to enable). - Go to the Roblox chat box and attempt to paste the image into said chat box.
- You will now find that your copy/paste has been broken.
At this point, the only options you have to fix this is to type into the chat and then copy that text, enter cmd /c"echo off|clip" in the command prompt, or close Roblox entirely.