I cannot reproduce this so far, even using the same folder names and the same two files.
Opus shouldn't mind if there is a + in the folder name as + isn't a special character.
[ul][li]Does it only happen with those two files, or with any files? (If it's only those two files, which of the two files is the trigger? Or does it have to be both at once?)[/li]
[li]Does it only happen if you copy to a network path, or also if you copy locally?[/li]
[li]Does it only happen if you copy via drag & drop between tabs, or also via other methods (e.g. Copy & Paste)?[/li]
[li]Does it still happen if the source tab isn't locked?[/li]
[li]Is Windows Explorer able to copy the same files to the same place OK?[/li]
[li]Is a crash dump generated matching the date & time of the crash? (If so it may let us see which code is crashing, and whether the crash is happening in Opus or somewhere else.)[/li][/ul]