A little more info as to how you are runnnig these two scripts would be helpful...
app.scriptPreferences.userInteractionLevel = UserInteractionLevels.interactWithAll;
var mDoc = app.activeDocument;
aSpell = "/Users/d.belyakov/Documents/tmp" + "/" + "spelling.idml";
app.scriptPreferences.userInteractionLevel = 1699640946; //NEVER_INTERACT;
// and here i start script, which start Indesign 5.5
File ("/Users/d.belyakov/Dropbox/Beliakov/my misc/myscripting/Alpina_spts/as_start5_5.jsx").execute ();
But before it starts, i got warning about trusting this script. And only after my confirming, CS5.5 starts and do the script commands.
Try placing the called script in… ~/Documents/Adobe Scripts/ or make use of the bridgetalk class and send a message to CS5.5 that will launch it if it's NOT already running and run some syntax…
OK. i did by placing special script into startup folder of CS5.5. And from first script just call CS5.5. When i have time, i'll try the bridge object. Thanks.