ver.1.56
in my huge(?) project, with many constructions as

proc My1,.a,.b,.c,.d,.e
enter
pushad
.......
popad
return

proc My2,.a,.b,.c
enter
pushad
.......
popad
return

sometimes program crashes (1/100 or more compiles). Debugging session shows that fasm sometimes generate code without first pushad:

enter 0000,00
........
popad
leave

all other code up and down from crash place is correct.
this can be my mistake, but strange, is not...?

If what you say is indeed correct, then problems like this could be caused by use of a variable that is not properly initialised.

To track down problems like this usually requires a little more information like the full source code, operating system you are using, list of other programs you may be running at the same time and exact steps of how to reproduce the problem.

if i catch it again, i will post all needed.

winPe exec.