Unable to resolve radio issue - Sochi-Adler

[Nialfb]

I have a mission starting at Sochi-Adler. There are two planes set to 'Take off from ground' ... Strike Force 1 and Test-1. Using the communication menu, neither plane gets a response from ATC when requesting start-up. However, if I copy Test-1 to Gudauta (Test-2), the radio menu works fine! In the 'Triggers' menu, I use  StopGaps in the mission, but I have tested with StopGaps both enabled and disabled and it makes no difference. StopGaps is not the problem. 

If I create a new mission from Sochi-Adler and copy 'Test-1' into the mission, the radio works fine!

Any ideas?

Thanks

Su-25T Airfield Strike.miz

[Nialfb]

By the way ... If I call up the ground crew for external power supply, or if I call up ATC to announce 'Inbound' during the flight, the radio works fine!