Disappearing texture bug

[Zippo]

I know this might be one of those ancient questions, but is there any way around that "disappearing base textures" bug ? I mean that one that occurs whenever a lot uses transparent textures and, for some unknown reason, the base terrain underneath sometimes vanishes (during game play) and leave behind only a bluish void grid beneath the lot (or specific parts of it).
This is really annoying. Any ideas on how to eliminate or minimise this problem?

[wes.janson]

This POST in the Rural Renewal Project talks about this and how to fix it.

[Zippo]

Thanks !