What I expected to happen was...:
I just wanted to play my 1.7.10 modded world, like I have for the last six years.

What actually happened was...:

Minecraft updated the launcher and now it crashes, AGAIN.  The last time this happened was a few weeks ago where your launcher update conflicted with the Myths and Monsters mod.  Pleas note that I haven't updated my mods in over 4 years because I enjoyed the versions as they were.

CAN'T YOU GUYS JUST LEAVE THE OLDER VERSIONS OF MINECRAFT ALONE?  All I want to do is have some fun and blow off some stress after a long day at work.

Steps to Reproduce:
1. Click on the Minecraft Launcher

2. Watch with dread as it auto-updates

3. Select 1.7.10 Forge from the drop down menu

4. Click on the green "Play" button

5. Watch in horror as it fails to load

6.  Read the short error message and feel helpless
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: cpw.mods.fml.common.LoaderException: java.lang.ExceptionInInitializerError
 

7. Log in to bugs.mojang.com and open a bug report

8.  Go find something else to do and try not to be pissed off that the software that I used las week, the one that I paid money for, several licenses over the years in fact, no longer works.