I have the same problem with the memory leak.
At our site we have a proxy server with Indesign 2019 the memory usage just keeps growing after a minute of use until it is unresponsive usually using well over 100GB.
Indesign 2018 does not have the issue.
If I connect to a network that does not have a proxy Indesign 2019 works ok.
So it seems, on our site, the proxy server is blocking something that Indesign 2019 is trying to access and instead of failing gracefully it chews up all the memory it can.
This problem has occurred on High Sierra and Mojave
I have the same problem with the memory leak.
At our site we have a proxy server with Indesign 2019 the memory usage just keeps growing after a minute of use until it is unresponsive usually using well over 100GB.
Indesign 2018 does not have the issue.
If I connect to a network that does not have a proxy Indesign 2019 works ok.
So it seems, on our site, the proxy server is blocking something that Indesign 2019 is trying to access and instead of failing gracefully it chews up all the memory it can.
This problem has occurred on High Sierra and Mojave