PayPal offers a workaround
Access your money right away with Funds Now.
[Activate Funds Now]
As I have checked, we have received reports similar to this that others are getting that type of error message. This happened just after recent updates that we had in the system. I sincerely apologize for the inconvenience this has cause. Rest assured that we are actively working on a fix.
As a workaround, I highly recommend to please follow the trouble shooting tips that will help resolve your concern.
clear cache and cookies.
delete browsing history
change browser's (IE, Google
Chrome, Firefox, Safari, etc.)
or to try a different device
---------------------
Geeze! Well I gave it a go, but you've guessed it....so I write back:
---------------------
That didn't work, on any browser.
As a workaround I suggest you fix the problem instead of getting your customers to try to workaround something that you updated that doesn't work.---------------------
Thank you for contacting PayPal Customer Support. My name is Kayla and I am happy to assist you. I apologise that the previous response did not assist you with this issue. In order to resolve this issue, can you please send me a screen shot and a source code (from your browser of choosing)?
I would like to escalate this to my technical support so that it can be resolved as soon as possible, instead of our customers being advised to try a different browser.

Comments
I never had my funds held previously.
Got the same message, but I just ignored it.