I'm not sure why my account was blocked, I had to change my password and it's fine now, but that's not the bug I'm reporting.

While your account is blocked, if you try to log in the launcher denies you access. As it should, however, it does this by crashing and doesn't tell you why. I couldn't figure out what was wrong until checking my email the next day.

Time: 09-23-2013
Frequency: ALWAYS

World name: ALL (Issue happens before world selection)
Character name: ANY (Issue happens before character selection)
NPC name: Not Applicable (Issue happens before character selection)
Monster name: Not Applicable (Issue happens before character selection)
Class/Level: Not Applicable (Issue happens before character selection)
Party or solo: Not Applicable (Issue happens before character selection)
In-game time: Not Applicable (Issue happens before character selection)
Area and coordinates: Not Applicable (Issue happens before character selection)

Steps:
1. Have account blocked for some reason (someone tried to hack you, whatever)
2. Try to log in.
3. Enter correct info, hit log in.
4. Launcher crashes rather then giving an explanation for a failed connection.

Connection Specs
Not related to connection, once account is unblocked problem goes away

PC Specs
Checked on multiple computers. Unrelated to the system attempted on, once account is unblocked problem does not continue.

The bug is not that I could not connect while my account was blocked, but that the launcher crashes when trying to log in rather then saying the account may not log in. This seems like a bug to me. My account is no longer blocked, so I cannot reproduce the issue.