You are not alone i am having a ton of problems with AP-800 FW1.03 in WDS/Repeater modes.
In fact i have nearly given up and going to return all kit. It is not working correctly no matter how i configure it.

oops take that last comment back.
If i hard wire 1 of the AP-800 into router and have one SSID it works any other combination does not.
I am working with them side by side !!!!! so will not even attempt to install 4 of them in a 60ft square space with walls!