This just happened to me after the last live update, both at my departure airport (LIRF), and arrival airport (FSDT KORD).
It's not very clear what do you mean with "the last Live Update".
If you mean you ran the Live Update when we released KSDF and the new GSX update, the most likely issue is that you didn't got all the latest files, because your local update server wasn't still fully synchronized with the master server so, you only had to run the Live Update again, maybe waiting a couple of minutes.
If, instead, you mean the last Live Update we released a couple of hours ago, to fix a problem with some doors not opening at KSDF, that's really strange, since we haven't touched any file related to GSX, just 2 objects at KSDF.