This has been a problem for me to for some time. I do not know / remember if it is only TIB_ or TIBO components. Helmuts solution is what i have used on many places since this behaviour changed (though i cast the first occurance of :par1 normally).

Also, i have posted (maybe here, maybe in the bugtracker - long time) a request to cater for the FireBird syntax that was introduced in 2.5. You can read about it here:

Best regards,

/Dany