The trail node calculates the incorrect velocity if you cache frames before $FSTART, and if the “Evaluate Within Frame Range” checkbox is checked. It must always be turned off, as is done by default.
This is a simple python script to change file paths in selected Read and Write nodes. You can select part of the Nuke script, and if the selected nodes have a "file" knob, it will be changed:
SyncToy 2.1 is no longer available for download from the Mircosoft website. But it still works great on Windows 10 and is used in many cases of work automation. You can download the latest release of SyncToy 2.1 here.