set XSI_EDITORS_WHITE_BG=1
This undocumented env var was mentioned on the XSI mailing list back in 2008 (ice tree background), but I found out about it another, more brute force, way.
* undocumented env var #1 was XSI_DISABLE_NEW_PICK (see also here, where XSI_DISABLE_NEW_PICK is a workaround for failed component selection in a virtual environment like Parallels)
eX-SI 
For some future episode, perhaps: XSI_DISABLE_NEW_PICK=1
From here: http://tinyurl.com/mczbzmb
😉
That’s actually “undocumented environment variable #1” 🙂
Oops… Looks like your loyal reader didn’t read it all this time… 😉
Byut youdon’t know anything more about #1?
Nope, never heard of it, not even during the beta.
Oh, and I updated the post with the info about #1 after you asked about it, and before I replied to you… 😉
Ignore mangled spelling and while you’re at it: ignore my presence in this thread 😀