patrickemin reported an issue where they were unable to create topics on desktop after updating two of their sites, although mobile functionality remained intact. The problem manifested as the composer opening hidden or disappearing upon scrolling. A console screenshot was provided but did not immediately reveal the cause.
NateDhaliwal suggested disabling plugins one by one to isolate the culprit. After patrickemin disabled plugins throwing console errors with no success, Nate asked if themes or components might be responsible. patrickemin acknowledged the difficulty of testing numerous themes/components but eventually identified the issue. The Discourse chat sidebar component was confirmed as the cause, as disabling it resolved the problem.
Hi, tonight I updated two of my sites, and I am unable to create a topic when not in safe mode and on desktop (works on mobile though), looks like the composer opens up hidden, sometimes it is visible when moving the page down but then deseapears. Happens of two of my sites, the third works normally. My console :
Thanks for your ideas.
Perhaps disable plugins one by one and test it? Then the exact plugin can be ascertained.
Yeah, can be a tough task but I will have to resolve doing that…
I disabled plugins that gave an error in console but to no avail.
Could it be themes or components?
Yeah it’s possible. I have so many of them, will be a chore to disable them one by one…
Eh… Discourse chat sidebar component when disabled , the problem goes away. 
