Good. This means that, in your existing account, a setting is bad or .plist file is corrupt. As identifying the rascal may take time, my suggestion is to move data to the new account, must be with administrative privileges. As the contents of each account is unavailable to the other, there are two methods:
- if you have a backup on an external disk, as you should (if not, consider this seriously, do not count on good behavior of hard disks), make a last backup on the existing account, and restore in the other account; when ready, delete the old (buggy) account
- if not, save your settings unto a flash drive; this is a limited backup just to avoid putting back settings for Mail etc. I am satisfied with iBackup (grapefruit.ch), but there are other backup utilitites, Time Machine, for example; TM does not allow limited backup, it works if you have a large external disk. If backup disk is not available, move files to shared folder, which is visible from both accounts, and from there to the new account.
May seem difficult, in fact it is not. You must just move data from one account to another. Now, take care to new apps you install or new functions you activate. When you notice something strange, that may be the cause of this behavior.
If unclear, comment and will try to help.