2 it is, and another time 4A.
Alright, I can read it now. SmartCrash just gives me a post mortum snapshot of what happened. A real debugger would be needed to trace the problem. AmiTradeCenter is branching into low memory (where ROM is mapped) probably from reading a NULL pointer. It finds some illegal code there and crashes. There is probably a corrupt setting or a failed load of a resource/library/gui element that is improperly checked. I doubt it's a hardware or memory problem as it's repeatable and you're system is stable. You can try the "rts" gadget of SmartCrash which will continue after the bad branch if it's a bsr or jsr. It sometimes works but AmiTradeCenter probably needs to exit after not loading something and will crash again. You could try SnoopDOS or Snoopy to see if anything is trying to load but fails before the crash. Look for a failed lock (probably the last before the crash) by AmiTradeCenter. This would tell you where it's expecting to find a file too. If there is no failure then maybe a settings file is loaded right before the crash. Delete it if that is the case.
NList.mcc, Listree.mcc, Busy.mcc are in SYS:System/MUI/libs/mui
Is that where they go?
That's the correct directory but it's in an odd place. They usually go in SYS:MUI/Libs/MUI but it depends on where your assign in S:user-startup is for MUI:. Mine is...
assign MUI: SYS:MUI
yours should probably be...
assign MUI: SYS:System/MUI
There is probably AmiTradeCenter assigns in your user-startup also. You might delete all those lines and delete your whole AmiTradeCenter install and then try a fresh install. If it still doesn't work, you might delete all the MUI assigns in user-startup and your SYS:System/MUI directory (with sub directories) and try a fresh install with the unofficial MUI install from the link I posted. Maybe try installing to SYS:MUI this time although it shouldn't matter. If that doesn't work, wait for your new accelerator and try it. If that doesn't work, try the old Windows trick and reformat the hard drive and reinstall the whole operating system

. If you don't want to do that, find yourself a different FTP program. FTPMount with DiskMaster 2 fulfills all my FTP needs.
I suppose I could copy my SYS over to an external drive and try this under WinUAE. That would at least say if it is a hardware issue.
Don't count on it crashing but it probably won't work right and might give a hint as to what is wrong. If it doesn't crash, you might try SnoopDOS or Snoopy again to figure out what isn't loading.