Lock-on indicator for the Stinger/IGLA is a game-related issue and I doubt that'll get solved until something else breaks.
In the meantime, just listen for the lock-on sound and fire when it's a constant buzz. An alternative is to hope that someone has a SOFLAM unit up and can do some painting for you to lock with the Javelin. The SOFLAM+Javelin combo is crazy deadly. And if you're playing with friends or if squad-mates are cooperative, you can negate a lot of land vehicles as well become the premiere anti-aircraft force.
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