The .NET framework is not necessary for ThorUI to run properly (only thing offered here at EQ2Interface requiring it that I know of is EQ2Maps).
The rule of thumb I use (and I'm sure Faetyl does too
) when it comes to fixing errors with the UI is to delete the thorui folder from your UI directory and run the updater to pull a fresh copy of the files. This simple (yet annoying if you use other people's work in conjunction with ThorUI like I do
) step usually fixes any issues with the UI.
Especially with the recent LU that came through, I would suggest doing this in effort to solve the issue.