Our server offers the possibility to pause your simulator. This is for several reason, one of them being navigation, if you are running in window-mode, switching from the process FSX to e.g. browser will pause the simulator. To remove this function you need to open the menu by pressing ALT, OPTIONS, the fourth from the left, open the OPTIONS tree and find SETTINGS and then GENERAL.
Once open it will look like this, unh00k the PAUSE ON TASK SWITCH and all is well, you can now browse and your plane will still be flying when you check on it. For the record, radio is received even with the window inactive.