Issue with MTH premium app/ TIU

Everything was hooked back up they way it was prior to taking it to be updated.

Perhaps it was not the same as before,

Regardless, first turn on the DCS signal for all channels on all TIUs by navigating to More.../Advanced Features/System Settings/TIU Settings and turning on the DCS signal for all channels on all TIUs.

I went into the advanced features and made sure all the DCS signals were turned on for all 4 channels of the TIU.  I currently have a very simple set up. Two oval tracks with each being powered by a MTH Z 1000 brick.  One  brick is attached to the fixed voltage 1 input, and the second brick to the fixed voltage 2 input.  Placed single engine on track and immediately starts up.

It sounds as if when you put the TIU back on the layout, you reversed the wires between the center and outside rails. The red TIU output terminal goes to the center rail and the black terminal goes to an outside rail,

I had problems with upgrade to Version 6 on TIU.   What solved my problem was to reset the TIU back to factory defaults. Reconfigured the TIU setting and then everything worked fine. I also reset the remote to factory defaults. You will loose all your settings and engines. Make sure you have Version 1.1.0 software on your WIFI unit.  

Hope this helps.

When you say you "reconfigured" the TIU settings what specifically did you have to do. I did go in and reset my TIU.  I also went under the the "more" button at bottom of main screen of app and selected "app settings". The version of the app is version 2.0.0 if I am reading it correctly. Thank you for your help.

It sounds as if when you put the TIU back on the layout, you reversed the wires between the center and outside rails. The red TIU output terminal goes to the center rail and the black terminal goes to an outside rails.                                            When I disconnected my TIU to have it updated by the local train store I left all wires in place except the hookups going in or out of the TIU.  All wires to the track stayed connected.  I have the wires leaving the fixed voltage channel 1 & 2 going to mth 12 port terminal blocks. The wires plugged into the ports were never unplugged.  All trains ran perfect before update. I attached to pictures showing the input and output fixed voltage channels on the TIU as they are currently set up. Thank you for your assistance.

To run trains on Fixed #2 you also need power into Fixed #1 in order to power the TIU itself.

Regarding your question on Reconfigured the TIU setting and then everything worked fine.

Reconfigured the outputs. Cause they will all off from setting them to factory defaults. 

I reset the all outputs to same setting as I had before the resetting the TIU to factory defaults. 

Hope this helps.

I do have a z1000 brick powering the fixed channel 1.  You can see the wires in the photo attached to the channel 1 input of the TIU.  The fixed channel 2 is powered by a second z1000 Brick. I have fixed channel 1 controlling one oval of track & fixed channel 2 controlling my second oval of track. Could there have been some type of glitch that occurred during the TIU update?  I even tried to use the remote this evening but had no luck with it either.  Not sure what happened.....Before TIU update trains ran perfect with system/ After update trains immediately startup and have no response using wifi app.. The only variable that has changed in the situation is the updated TIU plus the wifi app upgrade to premium.. Thanks again

If you reset the TIU to factory defaults and the remote and it did not work.

I would say at this point get the software reinstalled on the TIU and the remote.