Major Game Lock-up Problem

[Mephisto]

Load up the faulty players turn and just hit the end button. This way the AI will not change your diplomatic relations. Maybe it works without an error then. If not, try to chancel all movement orders. Usually the error just vanishes after only one turn. This shouldn't be too bad to skip one turn.

[dmm]

Have everyone halt all ships and pause all shipyards for one turn, process that, and try to continue normally. You could even remove all research projects from the queue. Don't know about intel. (Yet another reason to make it like research.)