The NTSC Retro Replay cartridge (either 3.8a or 3.8y) will load from SD card through the file browser and then display either a standard empty blue/light-blue C64 screen with the READY. prompt in the top left and a flashing cursor, or some fragment of "FILENAME:" in the top-left corner instead of jumping into the RR menu screen. If I go to the TC64's file browser and select it again, and again, and again, it will eventually work. About 1 in 10 tries works.
This happens when attached to my NTSC C64C or in standalone mode in NTSC. The PAL RR cart files work every time in either NTSC or PAL mode system (but of course won't load programs from disk properly in NTSC mode due to timing).
The NTSC Action Replay 5 crt image works every time in NTSC as well. This only seems to affect the RR NTSC images. When selecting the images in the file browser, it identifies them as type 36, "8k game" cartridge as well, if that matters.
The crt files are the same that I've used in Vice and I checked that the file wasn't damaged on the SD card by comparing the hashes.
This is on firmware 9q on a TC64 v2.