Pretty repeatable. Load GFX raw file, make selection, convert selection to sample, save sample, click append, hit control-rt-arrow to get next file. If that works, append data, click contl-rt-arrow, and get "Program has stopped" working window. Sometimes fails on first press of cntrl-rt-arrow.
Works with ARW files.
Win 10 Pro x64, 2x Xeon 12 core, 256 GB RAM.
Any ideas? Thanks.