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The porblem comes from redpower doesn't exist in 1.5.2 so you will lose all these items (and items from others mods too).
Plus gregtech changed a whole lot so it will be very different from 1.4.7 GT.
Sometimes when going through a portal my instance crashes.
Link to the crash report : http://pastebin.com/Hqyr0jY5
Tryed redownloading but it didn't fixed it.
Are you using the Retro pack ?
If you do it is not a bug but a feaure, this pach is desined to work with the FTB map.
You could make it work by removing the "YUNoMakeGoodMap" mod (Using the edit mod pack button)
When I try to look at the uses for acid in NEI the game crash and I get this report :
Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to...