The only time a 'Yellow' blocked icon appears -- at least from our experience -- is if the condition notes have a violation of some sort. For example, you specified 'New' as the items condition but your condition notes state something like 'Opened', 'Missing packaging' or other terms that would indicate the item is not in the condition for which it was listed.
Below is what is mentioned in the Help files about the 'Yellow' blocked icon:
To relist a blocked listing with a yellow icon, follow these steps:
In your seller account, on the Inventory tab, click Manage Inventory.
Under Show my inventory, click Inactive.
Find the item you want to relist, click the Actions link, then select Unblock from the dropdown menu.
On the Offer tab, in the Condition Note field, make changes to your comments. Remove any contact information (such as full or partial email addresses and telephone numbers) as well as URLs and website names. All references to other services, such as eBay or PayPal, should also be removed.
Click Save and finish.