The problem was found in sailboats from "The Mesh Shop" made by Dutch Mainsails, I reproduced it in the "TMS Palain" but it happens in many other models from the same maker.
After sailing in Bluesteel regions and entering a region that is not Bluesteel, the script "BOSS radar" located in a child prim silently stops running (no stackheap collision nor any error reported).
Attempting to set it back to running from another script while still in the non Bluesteel region with llSetScriptState("BOSS radar", TRUE) fails with " Could not find script 'BOSS Radar'
going back to a Bluesteel regions and attempting to restart it with llSetScriptState("BOSS radar", TRUE) works.
the issue doesn't seem to happen if you remain in Bluesteel regions, even after sailing the boat during about one hour so it will probably be sorted out when all regions will have Gingerbread release but until then, it is a big issue for people sailing, TMS being one of the most common sailboat brand and I've heard issues recently reported with some planes that might be caused by the same problem.