SITL with ROS+GAZEBO with default roslaunch file failing

Hello,
Trying to run mavros_posix_sitl.launch on ROS melodic on master. The model gets loaded in gazebo. But i keep getting :
‘’’ [ INFO] [1594396191.994243984, 11.344000000]: HP: requesting home position ‘’’
Parameter requests by mavros fail too.
‘’’[ WARN] [1594396525.504412157, 11.000000000]: PR: request list timeout, retries left 2’’’
‘’’[ WARN] [1594396526.505929592, 12.000000000]: PR: request list timeout, retries left 1’’’
‘’’[ WARN] [1594396527.506096478, 13.000000000]: PR: request list timeout, retries left 0’’’

Arming returns the following error:
‘’’[ WARN] [1594397002.947279956, 487.912000000]: CMD: Unexpected command 400, result 1 ‘’’

rostopic echo of global_position topics shows that they are not being published.

I followed the instructions here

It used to run before on an old(about 3-4 months old) master clone without any issues.

Am I doing anything wrong?

SH