If you click "super secret settings" after starting the game but before loading a world an exception will be logged in the console, although the game does not crash. This is not a major bug, but it could be an indication of a deeper problem. Here is the logged exception:
[20:50:53 INFO]: Client> kr: Invalid shaders/program/fxaa.json: null
[20:50:53 INFO]: Client> at kr.a(SourceFile:47) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpa.<init>(SourceFile:145) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpc.<init>(SourceFile:26) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpb.a(SourceFile:239) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpb.b(SourceFile:133) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpb.a(SourceFile:81) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bpb.<init>(SourceFile:47) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> at bll.c(SourceFile:163) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at bbt.a(SourceFile:93) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at bcd.a(SourceFile:172) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at bcd.d(SourceFile:236) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at bcd.k(SourceFile:211) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at azd.o(SourceFile:1303) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at azd.ad(SourceFile:753) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at azd.e(SourceFile:704) [1.7.2.jar:?]
[20:50:53 INFO]: Client> at net.minecraft.client.main.Main.main(SourceFile:103) [1.7.2.jar:?]
[20:50:53 INFO]: Client> Caused by: java.lang.NullPointerException
[20:50:53 INFO]: Client> at bpa.<init>(SourceFile:133) ~[1.7.2.jar:?]
[20:50:53 INFO]: Client> ... 14 moreComments 3
Confirmed in 14w02c.
[20:46:21 INFO]: Client> [20:46:21] [Client thread/WARN]: Failed to load shader: minecraft:shaders/post/notch.json
[20:46:21 INFO]: Client> lk: Invalid shaders/program/notch.json: null
[20:46:21 INFO]: Client> at lk.a(SourceFile:47) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brv.<init>(SourceFile:144) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brx.<init>(SourceFile:26) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brw.a(SourceFile:262) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brw.a(SourceFile:136) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brw.a(SourceFile:84) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at brw.<init>(SourceFile:50) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> at bof.c(SourceFile:150) [14w02c.jar:?]
[20:46:21 INFO]: Client> at bdr.a(SourceFile:150) [14w02c.jar:?]
[20:46:21 INFO]: Client> at beb.a(SourceFile:178) [14w02c.jar:?]
[20:46:21 INFO]: Client> at beb.d(SourceFile:240) [14w02c.jar:?]
[20:46:21 INFO]: Client> at beb.k(SourceFile:217) [14w02c.jar:?]
[20:46:21 INFO]: Client> at bax.p(SourceFile:1343) [14w02c.jar:?]
[20:46:21 INFO]: Client> at bax.ah(SourceFile:764) [14w02c.jar:?]
[20:46:21 INFO]: Client> at bax.f(SourceFile:718) [14w02c.jar:?]
[20:46:21 INFO]: Client> at net.minecraft.client.main.Main.main(SourceFile:154) [14w02c.jar:?]
[20:46:21 INFO]: Client> Caused by: java.lang.NullPointerException
[20:46:21 INFO]: Client> at brv.<init>(SourceFile:132) ~[14w02c.jar:?]
[20:46:21 INFO]: Client> ... 14 more
Is this still a concern in the latest Minecraft version 14w02c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.