Fsbuild-2 Flight Planner

Hi,
New situation now with my FMC in E3 Captain Sim...

After my flight plan is created through FSX Flight Planner and loaded in the FMC, I proceed to the departure process (no SID entered due to problem related in my other post ). Startup, take-off with LNAV engaged, autopilot off.
After take-off and above 1000ft, I enable the Autopilot with HDG feature in order to follow the SID inbound the SID Exit point.
Once passed this point, and established on the route toward my next reporting point, I switch the Autopilot to NAV. The aircraft starts turning starboard to look for "I don't know which point"... I double checked the following:
- Next point is OK (purple) in the tab "PROG"
- Next point is OK (purple) in the MFD

Then I immediately reverted to AP/HDG... I tried twice later while well established on the route, between two points and having checked the correct next point is shown in both FMC and MFD, but the same thing happened.

I gave up then and have finished my 3-hour flight using only the HDG bug and autopilot in HDG mode .

I have been trying to understand what could have happened, but can't find a reason.
The same situation did happen in the past a couple of times.

To be exhaustive, I need to specify that I am using AivlaSoft EFB in the same time. Is there any identified problem of compatibility ?
Thanks for your help
Bruno

_________________
Bruno
VATFrance member

FSX SP2
W7-64, Intel Core I7+3770K, RAM16Gb, SSD264 + HDD 2To, NVidia GTX660, Surround 3 x 29inc,
Saitek Yoke Pro + Throttle quadrant, Multi panel, Rudder pedals, Thrustmaster MFD Cougar x2

You have to turn on HDG sel on the autopilot, then press the LNAV button (the ISG Lnav button) on the panel.

ISG will then send heading to the autopilot to fly the route.