JER is installed and profiling works fine, but for some reason, the tabs do not show up. There's no crash report.

Using JustEnoughResources-1.12.2-0.9.0.52 (latest alpha at the moment)

This is the log found in logs folder:
2019-03-11-1.log.gz

This is the latest log:
latest.log

I don't know what other information I should provide.

Crash from the provided log file

[18:01:20] [Client thread/ERROR]: Failed to register mod plugin: class jeresources.jei.JEIConfig net.minecraftforge.fml.relauncher.ReflectionHelper$UnableToAccessFieldException: net.minecraftforge.fml.relauncher.ReflectionHelper$UnableToFindFieldException: java.lang.NoSuchFieldException: itemWeight at net.minecraftforge.fml.relauncher.ReflectionHelper.getPrivateValue(ReflectionHelper.java:210) ~[forge-1.12.2-14.23.5.2811-universal.jar:?] at net.minecraftforge.fml.common.ObfuscationReflectionHelper.getPrivateValue(ObfuscationReflectionHelper.java:106) ~[ObfuscationReflectionHelper.class:?] at jeresources.util.SeedHelper.getSeeds(SeedHelper.java:22) ~[SeedHelper.class:?]

Using some newer functions in forge, version 14.23.5.2779 or above is now required.

I'm experiencing the same issue (same error) using Just Enought Resources version 1.12.2-0.9.0.52 included in the Enigmatica 2 Expert modpack version 1.59a. I've seen users in let's play series using the tabs a few months ago using an older version of the pack. Version 1.59a of this modpack is using Forge forge-14.23.5.2781.

My own modpack using JER version 1.12.2-0.8.9.48 on Forge 14.23.5.2800 (older JER, newer Forge) does not have this error.

Don't know if this helps narrowing down the issue a bit further; but this is the info I could find. If there's anything more I can do to help find the cause; let me know.