Please try to run update of PGE toolchain first:
- Recently I have fixed some crashes related to quiting from Editor after LunaTester use
- I have added proper support for 38A's 1.4.5 files are now opening, however, the saving is still be compatible with 38A v1.4.4 (I plan to make a choice for what to save: for 1.4.5 or for 1.4.4).
Here is manual how to: viewtopic.php?f=11&t=1977
Which computer specs you have? (CPU, video card, size of your RAM, etc. you can find in "dxdiag").
Clunky LunaLua-SMBX backend needs more powerful hardware for correct work unlike PGE Engine (even it's WIP) and SMBX-38A which are able work on slower hardware. If you have 4 GB RAM or lower, you should close your browsers and some applications include Discord to reduce memory usage, otherwise, this makes two bad thins: inability to work of SMBX, and lag of a whole computer.