How do you open a mansion in the level builder?

[brell]

I know now why this happened. BtSO is an old mansion from the time when builders had to use resource editors to make signs. I opened the mansion in the builder, cut the sign text and removed the old sign. Then I added a new sign and pasted the text and saved everything. Bingo!

I don't know what styl is. I don't have a resource editor now but perhaps I should download Rezilla again.

Anyway, now we know that if a sign behaves like this it is propably because it was made

in the old days

with a resource editor and needs to be remade.