Keep in mind that ADAT cables are designed to be cheap and to work for a short distance only. So each connection will add loss, and at the end the signal is not high enough for a reliable detection.
I do not like plugin and removing ADAT connections often. So try to avoid any plug in connection using ADAT connecters that will be plugged on a regular basis. If you're using two racks all the time I'd suggest that you'll get something like this http://appsys.ch/en/products/extenders/adx-16 and use a cat cable. As a side-effect you'd be able to bridge larger distances.
Tomy
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