Unable to pull out weapon...

[Xombi Qilla]

did this ever happen to you? i the middle of a fight suddenly you can't draw your weapon, either gun or sword.

it's really p***ing me off.

[Just Life]

Are you using a frame with a exalted ability? There seems to be a bug with those at the moment that does just that.

[Slap Happy Pappy]

Has to do with melee + carrying an objective item.

[Hobofett]

I've had the same thing happen, either after changing weapons and getting knocked down or hitting my Tenno form after meleeing (while meleeing). Doesnt happen to often but enough to notice, but I've tried to force it so i can report it but it just seems to be a random Bug.

[blox]

If that sort of thing happens to me, jumping off a cliff to reset the warframe usually fixes it.

[Slap Happy Pappy]

going operator does it for me

[Krausser]

have you tried turning it off and on

[GunsForBucks]

This happens to me from time to time.
Many times out in Orb Vallis I get off the Kdrive and can't bring up a weapon and melee won't work either.

I do have my mouse wheel down set to "swap weapons" to switch between primary and secondary. Hitting this fixes it for me. Once a weapon comes out it is back to normal. The swap weapon control is unbound by default.