Okay, you're actually showing as being at (4, 4) on the planet at that position, and the other ship displays as being at (5, 4) on the planet at that position.Edited By: Syn on Year 7 Day 114 0:29
Which is odd since you say there's no planet. If that is true, one of the ASims may need to move one of the ships back into our dimension (E-mail email@example.com in that case, and include your handle, both ship IDs, and a quick description of the problem, since none seem to be interested in checking here).
For the record, white squares on the travel screen are typically caused by an out-of-date version of IE. You should be able to see just fine on IE7 or Firefox, which might help.