
The delete button/trashcan icon doesn't do anything, i've tried both chrome and firefox as i though it maybe some script is getting blocked or something.
Really hope you find a solution, let me know if it helps if i can provide you with anything (logs/ini/etc)
For now i'm disabling the rows by using the checkmark at the start of the row, that works fine. (as does saving/editing, anything but deleting)
It's been a bug for serveral releases now, i remember having troubles already a few months back but didn't pay much attention to it and thought i had a browser problem.
Just did some testing, and it seems to not work specifically for that Filterlist.
I created a new RSS filterlist, added some bogus filters, and on that new list i could add and then delete them as much a i want.
I do not want to lose / recreate my old list though, it's quite extensive and would be a pain in the ass to recreate.
but maybe it will help you pinpoint the problem.