HM2 ALL in cash out

We are working on a fix for this, i hope it will be released in the next Beta.

has this been fixed yet?

Yes, Beta 8673 was released some days ago:
https://www.holdemmanager.com/Downloads/Hm2AutoUpdate_8673.exe

Does the cashout featrure change the way 'Net Won' and 'All in EV' are calculated?

I ask this because we have a guy who always uses cashout and believes his net won is = to his 'All in EV' and the 'Net Won' is what he would have won had he not used cashout.

Is this true or do those two parameters run the same way they always did?

Afaik those 2 haven't changed.
But to make sure you should ask this question to support@holdemmanager.com where they can take a deeper look into it and ask the developers. Adding some examples to the mail would help us too.

You know I had allso some problem like this...I had KK in a sports on the flop when the guy had FD and I cash out...but the hand played and he got the flush...so I got the portion from those money when I cash out but HM2 showed that I lost 100bb...and it count it as 100bb minus in the active session...

Please send us the original handhistory file and we look into it