BCC v22 Speed/Feeds corrupted if file saved without post

Has anyone experienced spindle and feed speed rates decrease to an unexceptable level if the file is saved and reopened before the part is
posted in BCC V22.
Recomputing all tool paths to the corrupted file does not solve this situation if it occurs.
I find if I do not save between steps, set up all tool path features then post and save the problem does not occur.
Why?
The unexpected crashes that often occur prompted me to save between steps in the first place.
Would be interested to hear if this has occured to anyone and if so what is the solution?
Thanks in advance.