Hello

Before everything else, I'm using the FixT 6.7.3 version, so maybe that's what's causing the problem.

And the problem is:

I accepted quest from Zimmerman to deal with Razor.
Then I agreed to help Razor.
I did the quest for the Gun Runners, and got the weapons for the Blades.
I told Razor I want to show Zimmerman the disc.

Now, 1st time I attempted this, everything went smooth, but I accidentaly melted 2 of the Blades during the fight (the ooops, x was hit instead of y, and turbo plasma with sniper and 10 luck did the rest :) ), and Razor acted hostile after the fight. So I decided to reload the save I made just before talking to Zimmerman. Now, one of 2 things happen:

1. As soon as I finish talking to mayor, the game crashes (could not read from memory or smth).
2. The fight starts, but Blades dont show up, I dont get 2k exp I was supposed to get and Razor dissapears.

Is there any workaround? My earlier save is before all the deathclaw farming I did from 15 to 18 and I really would notlike to do that again.

I don't think it's FixT. The game has a tendency to break savegames from time to time (and the Boneyard part is still bugged), so it's most likely that happened and hence the advice would be to fall back to an older save, even if it's from before the farming (which isn't necessary to win the game after all).

Check here for details on the Boneyard and how to circumvent known bugs:
[url=http://user.tninet.se/~jyg699a/fallout.html#bone]http://user.tninet.se/~jyg699a/fallout.html#bone[/url]
It's not much of a spoiler as you've already played most of it.

Yeah, the whole Boneyard area is full of scripting error pitfalls (and the entire Zimmerman/Blades/Regulators part is worst of all). Always make plentiful saves there in case something goes wrong.

I'm sure FIXT will try to clean it up at some point, but it's a pretty big task to root out all the flaws.