As we noted a couple of weeks back, ARINC has been changing to winter frequencies for its High Frequency Data Link system. If you are using PC-HFDL, you might notice that it has changed back to the numbers. Leave it running long enough, and it will eventually acquire and load a system table off the air. At this point, it will start showing the frequencies again. Of course you have to know at least one active HFDL frequency to do this, but fortunately they don't change all of them.
The current system table is number 30 decimal, 1E in hex.
