Recently there have been a couple of issues raised in the forum that are due to FSUIPC not running, in particular when using MSFS 2020.
For me FSUIPC starts automatically with MSFS, and I am not using a batch file - so I went looking for an answer.
I found a detailed explanation, and a potential solution, on the excellent FSUIPC support forum - here: https://forum.simflight.com/topic/95918 ... -msfs2020/
The attached file provides a simple utility that will check that FSUIPC is running - it is fairly self-explanatory when executed.
It could be used, for example, to check if FSUIPC is starting once the MSFS configuration has been updated (although you should see a splash screen).
Hopefully the above will prove helpful to those having problems with MSFS 2020 and FSUIPC.
Cheers,
Martin