Throttle unusable above 3km

[MatthewJ00]

I attempted to launch a CactEye telescope by replacing the Mark 1-2 Command Pod on the stock Kerbal X with an aperture and a few other features. While the ascent was fine for the first three kilometers, as soon as I hit that altitude the engines would stop and the throttle would stick at zero. I tried this with and without MechJeb, and tested it with only stock game parts, where it worked just fine. What can I do to fix this without having to uninstall CactEye?

Update: This appears to be true of all modded parts, including MechJeb.

Edited March 14, 2015 by MatthewJ00

[Malah]

Hello, you use RemoteTech? on RT, a probe is limited to communicate to 3km, you need to take an antenne like Reflectron DP-10 to communicate in the atmosphere.

If you don't use RT, we need your mod list and perhaps your logs, you can read this: How To Get Support

[MatthewJ00]

Thank you, that fixed it.