Ok, I did something else just to try before the flight. I started up FSX SE and instead of choosing a default aircraft first at the airport of choice, I chose a Milviz 737, tried starting the engines to no avail, then when I tried to "end flight" it gave me this error message that I retrieved:
Log Name: Application
Source: Application Error
Date: 9/25/2016 8:25:42 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Charlie-PC
Description:
Faulting application name: fsx.exe, version: 10.0.62615.0, time stamp: 0x559f9a9a
Faulting module name: sim1.dll, version: 10.0.62615.0, time stamp: 0x559f9ab4
Exception code: 0xc0000005
Fault offset: 0x0005eb95
Faulting process id: 0x155c
Faulting application start time: 0x01d2172741555fe9
Faulting application path: C:\Steam\steamapps\common\FSX\fsx.exe
Faulting module path: C:\Steam\steamapps\common\FSX\sim1.dll
Report Id: 2c9ece16-831b-11e6-833b-180373dd44ea
Event Xml:
<Event xmlns="
http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2016-09-25T12:25:42.000000000Z" />
<EventRecordID>82791</EventRecordID>
<Channel>Application</Channel>
<Computer>Charlie-PC</Computer>
<Security />
</System>
<EventData>
<Data>fsx.exe</Data>
<Data>10.0.62615.0</Data>
<Data>559f9a9a</Data>
<Data>sim1.dll</Data>
<Data>10.0.62615.0</Data>
<Data>559f9ab4</Data>
<Data>c0000005</Data>
<Data>0005eb95</Data>
<Data>155c</Data>
<Data>01d2172741555fe9</Data>
<Data>C:\Steam\steamapps\common\FSX\fsx.exe</Data>
<Data>C:\Steam\steamapps\common\FSX\sim1.dll</Data>
<Data>2c9ece16-831b-11e6-833b-180373dd44ea</Data>
</EventData>
</Event>
I don't know if it's related. I will now try the flight after choosing a Milviz 737 AFTER I start with a default aircraft. I'll be back in touch.