Glad it worked, it's obviously not a perfect solution but at least you can watch shows. Takes a bit of fiddling around with search to avoid the home page but at least it works. You can also quickly scroll up to My4, just avoid the "watching" menu option which crashes also.
I too have this problem. If I'm logged in to the All4 app, it crashes before it can load the home screen or My4. It works if I'm not logged in, but I have to login to watch anything! This issue doesn't exist on other All4 apps, e.g. on iPad and iPhone. Come on Roku, contact the All4 app devs and get them to sort it out!
Streaming Stick 4k - 3820EU - 11.0.0 build 4193-CU
Actually they seem to have resolved it on my side. Try reinstalling or clearing cache. Might work.🤞