I just received an unconfirmed report that users who install the most recent updates of Oracle’s Java software will not be able to access the USPTO’s Private PAIR system. The update was apparently released on October 18 for PCs and November 7 for Macs. The USPTO has also been informed of the problem, but has not yet released any work-around. So, the cautious advice is to not update your system until the USPTO has updated its system.
When I say “unconfirmed,” I should qualify that the report came from a patent attorney who is suffering under the problem. In addition, I was unable to access Private PAIR on my office computer (that had updated Java) but can still access the system from my personal computer (that has not been updated).