Wetpixel readers have discussed in detail an issue where, when shooting with two strobes, Nikon D2x files are not written to the camera. The solution consists of removing all hotshoe pins, except for the trigger pin. Apparently, all problems are related to the use of a two strobe configuration. Here is the official solution sent to us by Stephen Frink:

Hot Shoe pin configuration for Canon 1D/1Ds MKII/5D and Nikon D2X/D200 digital cameras – In a recent post from Harald Hordosch, designer of the Seacam housing, we have been alerted to some problems users have been experiencing with dual strobes.  It has been particularly vexing with the D2X as shooters have had images disappear mysteriously, failing to write to compact flash card. 

In Harald’s words “We had no problems with the configuration I recommended in the past, but during our research to find the perfectly working i-ttl and e-ttl strobes (our Seaflash 250), we found out some new things. The problem occurs when shooting 2 strobes!  For this reason we have developed a special DUAL STROBE CONNECTOR which will be built into all shipped housings for 2006, and also can be retrofit by authorized SEACAM service centers.  These SEACAM hot shoe configuration sheets show how to adjust Nikon and Canon housings without this connector.  SEACAM is the only company which offer this very flexible hot shoe system!” Please note that directions on how to remove and reset pins, without tools or cutting wires, are included in the data sheets.

Here are the detailed instructions on pin configuration (with figures) from Seacam in PDF format:

Hotshoe configuration for Canon cameras

Hotshoe configuration for Nikon cameras