The same issue with duplicating, etc.
When attempting to duplicate a file I get an Invalid memory access and the operation fails in 4.2.3. Works fine in 4.1.9.
Also, in 4.2.3 the ability to type in the name of a file in the directory listing box seems to be gone. It will only go to the first character of the filename. So if there is a list of 40 files that start with S, I can only get to S. Not to Sz, by typing Sz.