I'm using Visual Studio 2015 Community edition and have been successfully uploading sketches to my Mega2560 w/ a Dragino shield for some time.  Then, sometime late September or early October the upload over WiFi stopped working.  The only way to load a sketch is to remove the Dragino from the Mega2560 and upload the sketch to the Mega via USB.  Either something in the Visual Studio/Vmicro world changed or some package I added to the Linino side of the Dragino.   
Has anyone else run into something similar?

Here is the compiler output

I'm not getting an error in VS, but the LED's on the Mega 2560 never flash like they are uploading.  The mega, stops responding to communications from the Dragino.  I've tried pressing the reset switch on the Mega to see if it just hasn't rebooted properly, and I've rebooted the Dragino/Mega combo by removing power.  After attempting the WiFi upload, the Mega is left in an unresponsive state, even when rebooted.  The only way to restore functionality is to remove the Dragino shield from the Mega, and upload the sketch via USB.

I've done a bit more investigating and think I may have stumbled onto something helpful.  I can successfully upload the sketch to the MegA2560 over the Dragino WiFi if I use the Arduino IDE.  When doing so, the Board is set to Mega2560 and the port set to the WiFi Yun IP address.  Whenever I try to do the same in Visual Studio, setting the board to Mega2560 seems to be unable to send the sketch:
ino6\bin\avrdude rduino6/etc/avrdude.conf" -v -patmega2560 -cwiring -P192.168.1.250 -b115200 -D 2560/Thermostat.ino.hex:i"
avrdude: Version 6.3, compiled on Sep 12 2016 at 17:24:16
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch
         System wide configuration file is uino6/etc/avrdude.conf"
         Using Port                    : 192.168.1.250
         Using Programmer              : wiring
         Overriding Baud Rate          : 115200
avrdude: ser_open(): can't open device "192.168.1.250": The system cannot find the file specified.
avrdude: ser_drain(): read error: The handle is invalid.
Upload failed
avrdude: ser_send(): write error: sorry no info avail
 
The only way the Visual Studio will attempt to load the sketch over WiFi is by choosing a board type of Yun. but then I suspect the compiled code is not compatible w/ the 2560 since it just goes unresponsive.  The attached pic shows the Arduino IDE settings which work every time.

Well, I figured it out thanks to that last post.  It turns out that when I upgraded the Arduino IDE, it deleted all of the installed boards, including the Dragino.  I downloaded and reinstalled the latest Dragino Yun Shield board support files and everything went back to normal.

Thanks for the post which prompted me to look at the installed boards.

KP