Hey, I assume you're looking here because you're having some client issues, So here are a few things to help out:
PLEASE MAKE SURE YOU HAVE JAVA BEFORE LOOKING AT THESE!!!
Client Issue? Opening and Closing? (Xx Miss xX) - 09 Nov 2016
Instantly Closing Client Fix (Scotty Dont) - 09 Nov 2016
Trouble Connecting? Try This (Tommy) - 07 Nov 2016
Basic Client Troubleshooting (Scotty Dont) - 13 Nov 2016
Client Download Extension Fix (Bager191) - 07 Nov 2016
Launcher Won't Run? Try This! (Omicron) - 04 Nov 2016
If none of the following fix your client issue: Please download this, then re-run your client.
This will fix your client issue most likely > as well as not opening up clients. Just Click >> jarfix.exe