I also started having this issue about 3 days ago and still have yet to be able to log on.

The steps I took were:
Updated IE to the latest Version (IE 11)
Went into the BOOT file and confirmed that the values were indeed 1 and not 0.
Took a working file from my laptop and copied it onto my desktop (this worked once. When I tried to re-log, it gave me a script error again).

edit: forgot to mention that I also disabled any and all pop-up blockers and extensions.

Can we get this thread noticed somehow by the admins?