Yosemite 10.10.5 Mail problem is worse now
OK, ever since upgrading to Yosemite, I have had the Mail app hang problem and have tried whatever I can find from here and the Internet to no avail.
Last night, I saw the new release 10.10.5 and it says there are fixes to the mail problem. I happily updated it. Now, Mail apps is even worse! I tried to add a new mail account and then decided that I made some mistake in the setting and wanted to delete it. However, clicking on the "-" button does not do anything at all. I tried to click on Mail and then select Accounts from the Mail app to bring up System Preference and got the error message that says "Preferences Error - Could not load Internet Accounts Preference Pane."
So, anyone else got this problem? What is the next step I can take to have this resolved?
Apple, come on, it cannot be that difficult to resolve this mail problem.
Thanks.
MacBook Air (13-inch Mid 2011), OS X Yosemite (10.10.5)