Dropped items not rendering properly in Direwolf20_1_5_2

[Droideka30]

Dropped items (eg pickaxe, Redstone dust, minium stone, etc.) don't render properly. Instead of turning to face the player, the visible side of the item always faces south (that is, you can only see dropped items straight on if you're looking north). This problem doesn't occur for dropped blocks.
Pictures:

Spoiler

 

[GuildMaster]

Do you have Optifine, by all means? You should check Optifine options. Also, try going to Options > Graphics: Fancy. Also, possibly a log could help. Besides that, do you have any other mods beside normal FTB ones?
It could also be a problem with your drivers, or Java version. Try updating it.

 

[Droideka30]

I haven't added any mods to the pack. I have enabled Biomes'o'plenty, although I doubt that would affect anything. Fancy graphics makes the items visible, but they still don't rotate as they should. Interestingly, dropped blocks do rotate normally.

 

[Droideka30]

I don't think its a problem with my java or drivers, because the problem only occurs in DW20, not in vanilla or unleashed.

 

[Droideka30]

I'm using a mac, if that makes a difference.

 

[Droideka30]

Does anyone know what the problem could be?

 

[GuildMaster]

Have you tried reinstalling? First make a backup of your FTB folder, then delete it and reinstall. I'm afraid this issue is indeed very strange.