A few days ago I experienced that certain bomb loadouts seem not to work anymore. For example, equipping only 4 bombs on the inner pylons - it doesn't matter which type - in combination with Matra 530s on Station 2 and 8 leads to the PCA showing what's in the screenshot I attached.
Since there are no weapons displayed, the PCA weapon selector buttons are all inactive.
An all-out 6 or 8 bomb configuration works, also bombs in combination with wing fuel tanks.
M-2000C Loadout.trk