Hi I'm not sure if this is right forum for technical issues if not apologies.

I've just started playing Galactic Civ 2 after years of far too much Civ 4 and it seems a lovely game but I'm having problems with the interface. 

The main thing that happens is that after playing for a while the main map starts to drift of its own accord. It will stop if you hold  down a mouse button (I think either but certainly the left) but continues moving when this is released until it ends up somewhere very far from the centre of the screen. I did find a single post about this by googling which said something inexplicit about the code getting fixated on searching for some particular ship but it wasn't at all cleat to me and none of the hot keys seems to help. 

From the lack of other posts this must be very rare so presumably at least something to do with hardware. So I'm pasting in system info. Obviously  there's more detail available if helpful to anybody,

Many thanks,

Jon

OS Name Microsoft Windows 7 Ultimate
Version 6.1.7601 Service Pack 1 Build 7601
OS Manufacturer Microsoft Corporation
System Type x64-based PC
Processor Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz, 3401 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 0906, 26/03/2012
SMBIOS Version 2.7
Hardware Abstraction Layer Version = "6.1.7601.17514"
Time Zone GMT Standard Time
Installed Physical Memory (RAM) 16.0 GB
Total Physical Memory 16.0 GB
Available Physical Memory 9.13 GB
Total Virtual Memory 31.9 GB
Available Virtual Memory 23.7 GB
Page File Space 16.0 GB
Page File C:\pagefile.sys

Name AMD Radeon HD 6800 Series
PNP Device ID PCI\VEN_1002&DEV_6738&SUBSYS_23051787&REV_00\4&2ECE1234&0&0008
Adapter Type AMD Radeon Graphics Processor (0x6738), Advanced Micro Devices, Inc. compatible
Adapter Description AMD Radeon HD 6800 Series
Adapter RAM 1.00 GB (1,073,741,824 bytes)
Installed Drivers aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver Version 9.12.0.0
INF File oem83.inf (ati2mtag_NI section)
Color Planes Not Available
Color Table Entries 4294967296
Resolution 1920 x 1080 x 60 hertz
Bits/Pixel 32
Memory Address 0xE0000000-0xEFFFFFFF
Memory Address 0xF7E20000-0xF7E3FFFF
I/O Port 0x0000E000-0x0000EFFF
IRQ Channel IRQ 4294967288
I/O Port 0x000003B0-0x000003BB
I/O Port 0x000003C0-0x000003DF
Memory Address 0xA0000-0xBFFFF
Driver c:\windows\system32\drivers\atikmpag.sys (8.14.1.6290, 540.00 KB (552,960 bytes), 19/12/2012 19:32)

I'm using directx11 and DirectDraw Acceleration, Direct3D acceleration and AGP texture acceleration are all enabled