It should.
Close the whole window, then open a fresh one and try with that. Does it still happen?
If it does, see what the format lock's tooltip tells you about where the format is coming from. (The more detailed folder formats FAQ explains in more detail, including how to find the tooltip.)
You can turn it off under Preferences / File Display Modes / Toolbars.
Please Ask one question per thread to keep threads easy to search and follow.
A screenshot of the error message would also help there, so we can see exactly what it says and if it's coming from Opus or TeraCopy.