wxGlade has an option for ‘overwrite sources’ in the application dialog:

I normally have it off, but when doing some exploratory testing I enabled it. This morning I was working on my main application and regenerated the code. Guess what? Yes, it overwrote every gui class. Three things led to this:

1. I had assumed the overwrite setting was stored in the .wxg file (it is part of the configuration for a given application.)
2. My main wxsGlade window is sized so that option is not normally visible.
3. The value for ‘overwrite sources’ is actually a global configuration.

So BE CAREFUL with this option. Fortunately, a svn update brought the code back to where it was just a few minutes earlier minus a minor gui change.