Finding the issue in the User's folder can be very difficult. Some issues are common and we know what to suggest to fix. The issue with images is not one that I am familiar with so not sure what to suggest. Often it is easier to move to the new User.
You can try fixes listed here: Troubleshoot Office. It's not just for Office for Mac but for general troubleshooting
http://www.officeformachelp.com/office/troubleshoot/
Transferring files from one account to another on the same Mac
Use your Shared folder:
- Log in to the account you wish to copy files from.
- In the Finder, navigate to the Shared folder. It is located in the Users folder.
Your Hard Drive/Users/Shared
- Copy any files or folders you wish to the Shared folder, such as items on your desktop, in your Documents folder, in your Music folder, and so forth. You may be asked to enter an administrator password when copying certain items. Note: To ensure that you copy items (as opposed to moving items), hold the Option key as you drag files to the Shared folder. Depending on item permissions, some files or folders will copy by default, some may move by default.
- Log out of the current account.
- Log in to the new account (that you are transferring files to).
- In the Finder, navigate to the Shared folder. It is located in the Users folder.
- Copy any files or folders you wish from the Shared folder to the desired locations, such as desktop, Documents folder, Music folder, and so forth. You may be asked to enter an administrator password when copying certain items.
If you are low on disc space be careful since this copies data. Move one item at a time then delete the original before starting the next copy.
Tip: Rather than move the default root folders, I like to create a folder in shared i.e. "documents", "desktop" etc and move the contents of these folders into the custom folder. When you move to the new User you copy the contents into the root folders.
The User's Library folder is one you need to be very careful in what you bring over. Most likely the issue is in your User's Library. Mail, browser settings and most of the items in Application Support are safe to bring over.
Remove User
Lastly, unless you are really low on disk space I would leave the test user for those times you need to troubleshoot. However to delete go to System Preferences > User's & Groups. Select the account and click on the - to remove.