Hey there,
Yeah, the issue's still happening.
Not sure if this error comes from my PC or maybe from their maintenance.
But here's the deal—I used to play just fine every day, no problems, then they had maintenance and poof, this error popped up.
The kicker is, it's the second time it occurred right after maintenance, and it took me a month to fix it the first time. I even removed my antivirus, turned off my firewalls, and eventually, it somehow got resolved.
Now I've deleted and reinstalled the game more times than I can count, wiped folders like bin 32-64, L10, etc... tried all sorts of fixes, but nothing works. Checked my firewalls again, cleaned my PC with Spybot, deleted Spybot afterward, and reinstalled the game. Kept checking the files with the launcher again and again... still nothing 
Hopefully, I'll figure it out someday.
The screenshot's in Greek, so it might be hard to understand.
It says: (translated using a translator)
AION Client: AION .bin - Application error
The instruction at 0x06266915 referenced memory at 0x00000000.
memory cannot be written.
Click "OK" to close the program
Warm regards
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