Hello,
I was running into the same problems @skois and @blaine07 after a CODE / collabora update. Finding the solution was a pretty frustrating journey and was buried in a forum post somewhere far along the trail. I could not find the solution in here either, but I might have read over it as the search options on this forum are not optimal, so please correct me if this a double post.
THIS is what worked for me:
post collabora/code:6.4.9.3 versions there have been some changes that need to be adjusted in your nginx collabora config, and in your advanced settings in your docker template.
Change in appdata\letsencrypt\nginx\proxy-confs\collabora.subdomain.conf
all instances of:
"loleaflet" to "browser"
"lool" to "cool"
Change docker template in advance view:
Web UI "https://[IP]:[PORT:9980]/loleaflet/dist/admin/admin.html" to ""https://[IP]:[PORT:9980]/browser/dist/admin/admin.html"