When you put a Diamond, Iron ingot, Gold ingot, or Emerald in a beacon slot to activate it, the beacon does not active. and you cant change current settings on pre-activated beacons either
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Can confirm. Doesn't work for me either.

I also can confirm. I select the enchantment, put the item for activation, click the activation button and the beacon ui closes but the enchantment doesn't activate.

same here

32a in the same error continues with new beacons ..

Confirmed, here's the server output with the backtrace:
[Server thread/ERROR]: Couldn't set beacon
java.lang.IndexOutOfBoundsException
at io.netty.buffer.EmptyByteBuf.readInt(EmptyByteBuf.java:470) ~[minecraft_server.14w32a.jar:?]
at hb.readInt(SourceFile:639) ~[minecraft_server.14w32a.jar:?]
at rg.a(SourceFile:1051) [minecraft_server.14w32a.jar:?]
at ma.a(SourceFile:55) [minecraft_server.14w32a.jar:?]
at ma.a(SourceFile:8) [minecraft_server.14w32a.jar:?]
at ie.run(SourceFile:13) [minecraft_server.14w32a.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_55]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_55]
at net.minecraft.server.MinecraftServer.y(SourceFile:575) [minecraft_server.14w32a.jar:?]
at pl.y(SourceFile:305) [minecraft_server.14w32a.jar:?]
at net.minecraft.server.MinecraftServer.x(SourceFile:530) [minecraft_server.14w32a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:446) [minecraft_server.14w32a.jar:?]
at java.lang.Thread.run(Thread.java:744) [?:1.7.0_55]
agreed. just made a test world. beacons are not activating any level of enhancement.