February 2017
I have finished Garrus Loyal mission for long and earned his loyal, but I haven't noticed that I couldn't upgrade his special talents until now. It is still being locked for unknown reason. Does anyone know how to fix this bug?
+ And yes...I did talk to him after coming back to Normandy for gaining end-quest conversation. => Gaining loyal
+ The result of this quest is his loyal for no matter which choices.
March 2017
There are no Squad Points available and that is indeed strange.
Try to repair the game. (in Origin > Game Library > right click ME2 > Repair)
If that don't helps try another save game, one that is older than the one you started the mission with.
If you don't have one or if it is to far back, you could use the "Mass Effect 2 Gibbed Save Editor" to correct the points.