Same thing here. Medium map, no modding. I believe I started the game before the most recent patch (it was around that time, anyway). When I hit "End Turn," the button just goes away. I can still move around the map and do some things (launch ships from orbit, for example), but I can't move ships, even ones that had moves left.
I won't post my entire debug.err file... they're pretty big. If you think system specs are relevant... my system has almost nothing in common with the guy who posted his file already. We have the same amount of RAM, but I'm running WinXP on an Intel processor with ATI graphics and a SoundBlaster sound card.
Anyway... I loaded the game, hit "end turn," saw that the button just disappeared as usual, and I alt-tabbed and copied the last little bit of debug.err so you could see what was going on right when the button was pushed:
Debug Message: Killing threads.
Debug Message: Kiling civs.
Debug Message: Killing ships.
Debug Message: Killing rallypoints.
Debug Message: Killing misc objects.
Debug Message: Killing stars.
Debug Message: Killing anomalies.
Debug Message: Killing space resources.
Debug Message: Killing colonies and planets.
Debug Message: killing scenario.
Debug Message: Clear galaxy settings.
Debug Message: Clear influence.
Debug Message: Clear up laws.
Debug Message: Clear first time events.
Debug Message: Clear wonders and trade goods.
Debug Message: Clear sector mapper.
Debug Message: Loading Custom Map
Debug Message: Loading Data Defs
Debug Message: Clear data definitions.
Debug Message: Loading TechDefs
Debug Message: Max num techs: 248
Debug Message: Loading ImprovementDB
Debug Message: Loading Component Defs
Debug Message: Loading ShipTypes
Debug Message: Loading ShipConfigs
Debug Message: Loading AnomalyTypes
Debug Message: Loading RandomEvents
Debug Message: Loading UPIssues
Debug Message: Loading ResourceTypes
Debug Message: Loading InvasionTactics
Debug Message: Loading SBmodules
Debug Message: Loading PoliticalParties
Debug Message: Loading Planet Types
Debug Message: Loading Star Types
Debug Message: Loading Game
Debug Message: Loading Galaxy
Debug Message: Loading FOW Map
Debug Message: Loading ZOC Map
Debug Message: Loading Planets
Debug Message: Loading Stars
Debug Message: Loading Anomalies
Debug Message: Loading Resources
Debug Message: Loading Civs
Debug Message: Loading Colonies
Debug Message: Loading RallyPoints
Debug Message: Loading Ships
Debug Message: Loading Fleets
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Can't find ship type Fleet in definitions
Debug Message: Loading ENDGALAXYDATA
Debug Message: Updating ZOC.
Debug Message: UIBeginGame called with g_ulLocalPlayerID = 7
Debug Message: UIBeginGameHelper: New Game Started
Debug Message: BuildShip: Cannot build ship type 4-Fighter M6-9 at Toria IV - No open slots
Debug Message: BuildShip: Cannot build ship type 11-Constructor M6-9 at Akilians III - No open slots
Debug Message: BuildShip: Cannot build ship type 12-Constructor M6-9 at Carinoids II - No open slots
Debug Message: StackedShipsWnd: Cannot find OBJID Stacked_Logistics_Value
Debug Message: StackedShipsWnd: Cannot find OBJID stacked_Fleet_More_Button