Hi Mark,
I'm sorry to hear you are still experiencing difficulties of this nature. I'm still not sure when we will be able to address the compatibility issue between our description editor and Internet Explorer 11.0 that I mentioned previously, but I am not aware of any current issues that would cause you to encounter similar behavior when using Chrome or Firefox.
Based on your description of what you are seeing when you attempt to revise your descriptions directly through eBay, I believe the description editor is most likely just set to HTML mode. Provided that is the case, just click the “Standard” tab in the upper left corner of the editor and you should be able to make changes without using code.
Also, if you are still interested in reverting back to Internet Explorer 10.0, you may want to try and do so via the following process since you were unable to do so successfully using the link I included in my previous reply:
1) Select “Control Panel” from your Windows “Start” menu
2) Click the “Programs” link
3) Click “View Installed Updates” within the “Programs and Features” section
4) Right click the update called “Internet Explorer 11” and select “Uninstall”
5) Restart your computer when prompted at the conclusion of the uninstall process
Once you have uninstalled this update and restarted your computer, you should find that you are using Internet Explorer 10.0 once again the next time you launch Internet Explorer. You can confirm this by selecting “About Internet Explorer” from the “Tools” (gear icon) menu within Internet Explorer.
I see that you filed a support case about this issue as well, and we will update you through that case as soon as this issue has been addressed or any other related information becomes available.
-Mike