FYI, I do have Grammarly, but it has not affected my ability to type this message, nor in the eBay Feedback window.
Sometimes something does not work in a particular browser, but the same feature may work in another browser. This may have to do with conflicts related to cache, cookies, settings or extensions.
Disabling Grammarly seems to fix some problems with composing eBay messages for some users. I have not heard of any issues involving Grammarly and leaving feedback or posting on the community discussion boards. The fact that Grammarly does not interfere with one feature does not mean it will not interfere with another.
eBay coding made a change and it doesn't work.
That is entirely possible. It is also possible that Grammarly made a change that conflicts with eBay's code. Or both made changes that are not compatible. Ultimately it does not matter much to me who is "at fault", I just want to be able to send messages, and to explain to others having problems how they can work around those problems to accomplish their goals. If disabling Grammarly allows you to compose a message and you could not while Grammarly was enabled, do what you need to do.
If disabling Grammarly does not help, try disabling other browser extensions or try another browser with no extensions installed. In the course of troubleshooting this issue I discovered I had a problem composing eBay messages in Chrome until I disabled my ad blocker, and then the problem ceased. Other browsers did not have the same problem, despite similar ad blockers being installed. Was the problem with Chrome, eBay, or the particular ad blocker? I don't know and I don't particularly care. Knowing who is at fault does not help me; knowing how to work around the problem does.
