Arthur ( one of the Smoothie devs ) here.
3D Seed BARCELONA : The problem between Simplify3D and Smoothie at this point, causes freezes ( the board answers and blinks, but stops moving ) on high-detail models and/or circles, always at the same point in the print. This has been reported by many users. It occurs only on some 3D models, with some configurations and versions of the firmware.
The problem only occurs with Smoothie, not Marlin or the other 8-bit firmwares, possibly because they are not powerful enough to process the high-detail G-code as fast as Smoothie does.
The problem only occurs with G-code generated by S3D, not that generated by Slic3r, Cura and others. We suspect this could be because S3D ( being younger ) doesn't yet have the small-move-cleaning features those more mature slicers have ( we have seen moves as small as 0.00001mm in S3D G-code, which doesn't really make any practical sense ).
We have tried to work with S3D on solving this issue, but they have been far from cooperative.
BTW : If you want to rule out USB as the source of the problems, play the file from the SD card, or use Ethernet. If the problem still occurs, it's not USB
BaudR8 : I'm really surprised, I have never heard of that G92 bug. Could you please tell me more about it, and even ideally if possible, submit the bug as an issue on github ?
About the problem with M104, that has been fixed a good while ago : https://github.com/Smoothieware/Smoothi ... 5a83557bb5