Strange Tool Change question to tool length comparison

Hi,
i have an old Linuxcnc system with manual Toolchange which
behaves like t1 M6 and if next tool T2 M6 for instance the length difference of Tooltable is used
Now a very new Linuxcnc installation (the latest ISO Disk ) the T2 m6 requires an G43 to use the tool length compensation

so my question is that a change to Linuxcnc newer version or is there any hidden ini magic to change the behavior ?
in worst case we do need to change the post processor of the cam for the one machine and another for other machine ?

i use linuxcnc for a verry long time but that would help me a lot
thomas

Maybe, in the ini files on your two versions under the RS274NGC section, does the RS274NGC_STARTUP_CODE = line have a G43 on it in the old config and not the new one?
linuxcnc.org/docs/2.6/html/config/ini_co...sub:RS274NGC-section

Otherwise I don't know why the behavior may have changed for you. But for myself I consider it the best practice to explicitly state G43Hn after every tool change anyway.

It is possible that the previous system had "auto G43" turned on.

(You can be forgiven for not finding this setting, it it documented in the wrong place)
linuxcnc.org/docs/2.7/html/remap/remap.h...i_file_configuration