ProMods

Hello everyone. Since a few weeks ago, I've been starting to make a map at the map editor. But, I don't know why, some of the signs are "invisible" or something, because I can edit their properties but that signs do not appear. It didn't happen a few days ago. Can anybody help??

Thanks!

Added in 2 hours 56 minutes 13 seconds:
Also, I have another problem. My sign editor isn't working at all. The image of the sign appears in black, so I can't edit very well.