mikemalan,
The first error number (18904968) is a “NO SESSION” error, this happens sometimes when your session times out but you should be able to login again after refreshing the login page. I’m not sure you new switch had anything to do with it. Reguardless, you can upgrade my plugin to version 4.15.40 to avoid getting that error in the future.
A. Mortos,
Your error number (21007726) refers to a JavaScript or Time Sync error, This one is a little bit trickier. The JavaScript on your login page is being generated from cache, not from live PHP, so the timestamp index in wrong and no longer matches the actual time generated in the code. I don’t know what you have in place that is caching your login page but I am going to have to release a fix for this. In the mean time you can simply add some random characters after a “?” to the end of your login URL as a workaround, this will force the page to be re-rendered, not from cache.