More details, please. Do you use Quicken Mac or Quicken for Windows? What version, edition level (Starter, Deluxe, etc.) and release (R xx.xx) of Quicken are you using? US, Canadian or other country version? Click Help / About Quicken (Mac: Quicken / About Quicken) to get this information.
In your Tools / Category List (*) does a ghost account named something like ACCT_xxxx appear as a category? (e.g., ACCT_123a) If so, try deleting it.
(*) When viewing the Category List, please make sure the Category List is set to "Show Full List", "[x] Show hidden categories" is selected, the list is sorted by category name and "All Categories" is selected in the sidebar on the left.
If you haven't done so already, please do the following actions: • Even if you are on the latest software level already, download and install the latest Mondo Patch file from https://www.quicken.com/support/update-and-mondo-patch-20182019-release-quicken-windows-subscription-product to ensure your Quicken software is up to date and correctly installed. • Reboot Windows. • Validate and Supervalidate your Quicken data file. • If nothing helps, try to restore your Quicken data file from an Automatic or Manual backup taken just prior to the problems first occurring. https://www.quicken.com/support/how-backup-or-restore-your-quicken-data Validate and Supervalidate instructions First save a backup file prior to performing these steps Validate: • Click File • Select Validate and Repair File... • Select Validate File • If the data file contains investment accounts also select "Rebuild investing lots". If you suspect that a damaged Quotes Price History causes your problems, also select "Correct investing price history" functions "Delete" or "Repair and Rebuild". • Click OK • Close the Data Log • Close Quicken (leave it closed for about 30 secs) • Reopen Quicken and see if the issue persists. Super Validate: • Click File • Press and hold both CTRL and Shift keys while you click Validate and Repair File... • Select Supervalidate File • Click OK • Close the Data Log • Close Quicken (leave it closed for about 30 secs) • Reopen Quicken and see if the issue persists.
There must be something else that's corrupted in your Category List. You mentioned that you found and removed a ghost account, ACCT_xxxx. Is there more than one? Is there a duplicate category in the list, one that's spelled exactly like another category or [account name]?
After reviewing your list (again), if it looks clean, if you haven't done so already, I'd say it's time to call Quicken Support on the phone during posted hours of operation and request help. Let them do a screen share session with you to review the situation on your computer, to determine the nature of the problem and to figure out how to fix it. Quicken Support: - To contact Quicken Support, please use this link only:https://www.quicken.com/support#contact-support and select Chat or Phone support. - Support is only available during posted hours of operation - The phone number can be found at the support website. - To start Chat or see the support phone number, your browser must allow popup windows from https://www.quicken.com - If you are eligible for Premium Support (purchased separately or included as part of your subscription to Quicken Premier or HB&R) call the number that can be found at the top of your My Account page at https://www.quicken.com/my-account (US) or https://www.quicken.com/canada/my-account (Canada) when you log in with your Quicken ID. Place the call using the phone whose number is recorded in your account profile. - Other links or phone numbers found elsewhere on the Internet, even in some posts or emails received from other Community members, may not be from Quicken or may not be up-to-date. Use those at your own risk. - Unlike other so-called "Quicken support providers", the real Quicken Support is free for all currently supported versions.