Feed The Beast

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So whenever I try to change texture packs from default to say Sphax for example it doesn't let me.
FTB Freezes as it does when changing texture packs. Then it just stays as default and unfreezes.
I am assuming the problem is caused by Optifine which I have installed although it is a custom version made to work with FTB.
I am also on the DW20 1.6.4 pack.
Any help would be appreciated :)