GM Miss advised me to post this bug here.
I'm a Dual Pistols and Devices Blaster. I respec'd and just took Sleep Grenade and LRM Rocket Launcher from the Munitions Mastery set. When activating either power, the character postures correctly and both powers work however there is no visible weapon. I'll update with a screenshot when I get it but it's pretty straight forward - no visible weapon when power is activated.
Thank you!
@Starwind