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We were having a lot of difficulty with switching user accounts on our iMac and Diablo III.
As far as we could tell, my friend was typing her Battle.net ID and password correctly into Diablo. She should log in to the web site just fine. But still she'd get incorrect username/password (Error 315300 - http://us.battle.net/support/en/article/error-315300-incorrect-usernamepassword ).
Eventually we discovered that she had to be logged into the iMac under my account (which Diablo III was installed from). It wouldn't work from hers. Her account is also an administrator account. Diablo III would ask her for her local Mac credentials whenever she tried to run it, so I assume Diablo III is trying to create some files somewhere and failing.
Posting this in case other people run into the same issue. Just run Diablo III from the Mac account that installed it for now.
After the series of patches, Diablo 3 would simply crash before it finished launching.
I looked around at the files in /Applications/Diablo III/ and found quite a mishmash of file owners, so I normalized them.
I then noticed a bunch of files in /Users/Shared/ with user-specific permissions. Why? Why are settings that seem like they're user-specific stored in a location intended only to be shared across users? And why would acceptance of the ToS be a Shared setting? Anyway, I made those files group-writeable and then was able to launch Diablo III again.
Everything seems to launch fine, but as soon as we try to log in the game crashes. The game still works just fine from the user account that installed it.
Edited by Gildorn#1652 on 7/14/2012 10:50 AM PDT
Exactly the same problem with us,
"Everything seems to launch fine, but as soon as we try to log in the game crashes. The game still works just fine from the user account that installed it."
I tried to uninstall and re-install, now just the other account can log in...
Please guys fix that!
You can be no an administrator account and still not be able to log in if the file permissions do not allow you to open the files necessary for Diablo 3 to launch.
You should repair permissions using the following instructions first and see if that solves the problem:
1) Navigate to the folder containing your Diablo III folder, and then highlight your Diablo III folder in the Finder.
2) Right click the Diablo III folder icon and select Get Info.
3) Click the Padlock icon at the bottom of the Get Info window and enter your administrator password (this authenticates you as an administrator).
4) In the Sharing and Permissions tab, select the Everybody group and choose Read and Write option in the Privileges pulldown menu. Make sure you are working with the pulldown menu on the same line as the Everybody group.
5) Click the Cogwheel icon at the bottom of the window and select Apply to enclosed items. When it asks you to confirm this, select OK. Close the Get Info window.
Your permissions are now set properly for Diablo III and all of its game files.
6) Navigate to your /Users/Shared folder in the Finder.
7) Right click the Blizzard folder and select Get Info.
8) Repeat steps #3 through #5 for this folder, then close the window.
9) Right click the Battle.net folder and select Get Info.
10) Repeat steps #3 through #5 for this folder, then close the window.
Diablo III and World of Warcraft Technical Support MVP
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