Lockheed Martin have just released hotfix 1 for Prepar3D v4. We should see the 777-300 being released soon as PMDG stated they were waiting on the hotfix.

The Prepar3D team is excited to announce the first Hotfix update to Prepar3D v4.0 ( It can be downloaded immediately from the Purchased Downloads section of the website.

It addresses many reports and requests from our forum users.

For those that are interested in updating, only the Client installer is required for Prepar3D v4.0 Hotfix 1. The Content, Scenery, and SDK installers are optional. You must first have Prepar3D v4 installed to utilize the Client only installer.

To install the new Client, you must first uninstall your current Prepar3D v4 Client via Programs and Features in Windows Control Panel.

The Prepar3D v4.0 update will require you to reactivate your product, however if you have an internet connection or have not made any major hardware changes between installations this should not be an issue. For more information please view the Prepar3D v4 Download and Installation Directions.

The newly posted Prepar3D v4 ( Full Download on the Purchased Downloads page includes the Hotfix.

Please be aware that some third developers might have to update their add-ons to be compatible with the hotfix. Please contact the third party developers directly for any compatibility questions.

Prepar3D v4.0 Hotfix 1

Fixes and Improvements

Fixed an issue in VR views that prevented dynamic lighting in the right eye
Fixed memory leak related to external views and vehicle textures
Fixed for performance impact when entering and then exiting VR
Fixed text label size mismatches in VR
Fixed the F-16 speedbrakes
Corrected an issue where when saving a scenario from startup screen it would not respected after a reset
Preventing vehicle sounds from playing during load
Fixed a crash on startup due to controllers using bad port and hub values
Added an unobtrusive watermark for developer licenses
Fix for a crash when using index 0 with playload stations
Fix for ICAO entries in the Logbook
Corrected the clickable mouse area of the RadarGauge
Added the Delete Scenario button back to the Scenario user interface
Fixed for effect texture orientations being flipped (e.g. coastline waves)
Fixed for the Graphics Profile Name not syncing with the correct saved graphics settings
Fixed issue related to the flag SIMCONNECT_CLIENT_DATA_PERIOD_ON_SET not working with SimConnect_RequestClientData
Corrected issues with autogen Annotator building selection that would result in missed or incorrect selections
Interface windows will no longer move behind main window when losing focus
Fixed Logbook issue that was preventing logging start/end points
Corrected various issues with the Flight Instructor user interface
Added pitch, bank, heading to the GPS broadcast capabilities for electronic flight bags
Updated various XML configuration file encodings
Corrected a commands binding error with the Steering Set key
Fixed null terminating string issue when using RequestDataOnSimObject with ATC strings
Fixed issue preventing the vehicle preview screen from rendering in the New Scenario window
Changed the default textbox to ICAO for the Select Airport user interface
Fixed multiplayer crash when using Direct IP connections
Fixed errant river feature in ocean QMID 50,31 (West Africa)
No longer instantiating radios if they are not configured for an object
Fixed an issue where the vehicle preview window would not render in certain views
Fixed an issue where View Group selection would be out of sync with the context menu
Fixed an issue where undocking views would not immediately be processed
Fixed unicode issues with Traffic Toolbox
Fixed an issue where second UV channels were not correctly being exported to .X files
Fixed scenery.cfg encoding issue after leaving the Scenery Library view
Fixed an issue where SimConnect applications were receiving the wrong event id
Fixed an issue regarding minimum temperature in the Advanced Weather view
Fixed an issue where the Scenery Library was not reporting all errors
The Select Airport view’s ICAO search box is now above other search boxes
Minor layout updates to the Select Airport screen
Content error reports will now have more detailed XML parse error messages
Fixed a crash in the Shp2Vec tool when compiling polygons with less than three points
Fixed an issue where malformed DLL.xml and EXE.xml files would cause Add-on DLL and EXE to fail to load
Fixed an issue where multiplayer settings were not correctly assigned when using the Direct Connect method
Added reverse thrust axis events
Fixed issues with certain locale settings
Fixed incorrect locations of certain buildings and bridges in Instanbul
Traffic settings now save again in Graphics Profiles
Added exception handling for error that would occur when certain audio codecs were installed
Fixed crash that could occur when making modifications to the Scenery Library with add-on scenery
Fixed issue that caused stars to draw in the incorrect order
Added Show Only Favorites button back to Vehicle Select Screen