For the latest MAX OS X versions of 10.6.5 and 10.6.6, we have observed the problem of inteference with Remobo's Virtual Interface from MobileMe/Back-to-My-MAC:

MAC OS X problem of MobileMe/Back-to-My-MAC

The Remobo team is building workaround for this problem now, and it'll be available in the next release.  Meanwhile, you can apply the 1-command workaround above to get it fixed for now.  Let us know of your feedbacks here.

UPDATE: This problem has been fixed in Remobo v0.50.6, by automatically restoring the Remobo Virtual IP address that's deleted by Back-to-My-MAC.   We still think it's an Apple's bug on MobileMe/Back-to-My-MAC, though our Remobo users don't have to worry about it, after v0.50.6.