(Digital Money World) Since Paypal has introduced Safer Payment, which has given rights for Paypal to hold an eBay Item Sale money up to 21 days.. These might be the reasons that the money was held as Monroe Labouisse, director of Paypal’s business on eBay in N. America explains,
The bottom line is that established sellers with a good track record should not be concerned.  PayPal will not hold payments for eBay items if sellers:

Have been an eBay member for more than 6 months, and
Have a total Feedback score greater than 100, and
Have a buyer satisfaction percentage of 95% or better. …read more

Sarah Livnat, Paypal has updated on the upcoming Expanded Seller Protection, and what to expect from them. On summary in a nutshell,

No more confirmed address. Merchants can ship to whichever address the buyer provides them through PayPal whether it is confirmed or not.
No more coverage limit. The coverage payout limit under the Seller Protection Policy is $5,000 per year. Expanded seller protection has no limit.
Coverage in more places around the world. Coverage is now extended to the 190 markets supported by PayPal, so merchants can ship to customers wherever they are.
No additional integration required. Merchants won’t need to go through …read more