Hi Andy, thanks for getting back to me. This is the error code I got when I tried again, and I've attached the full error report in case that's of any use.

date/time         : 2022-10-07, 14:49:41, 543ms
computer name     : HQ34-TERMINAL
wts client name   : HQ-CPD-WS116
user name         : charlie.davis
registered owner  : Windows User
operating system  : Windows 2008 R2 x64 Service Pack 1 build 7601
system language   : English
system up time    : 197 days 1 hour
program up time   : 3 hours 23 minutes
processor         : Intel(R) Xeon(R) Gold 5118 CPU @ 2.30GHz
physical memory   : 1003/2047 MB (free/total)
free disk space   : (I:) 496.44 GB (R:) 28.98 GB
display mode      : 1600x900, 16 bit
process id        : $1d10
allocated memory  : 43.23 MB
command line      : RecorderApp.exe /65616
executable        : RecorderApp.exe
exec. date/time   : 2017-12-14 22:09
version           : 6.28.0.287
compiled with     : Delphi 7
contact name      : Charlie Davis
contact email     : charlie.davis@wwt.org.uk
madExcept version : 3.0n
callstack crc     : $8d745569, $726250b0, $726250b0
exception number  : 1
exception class   : EOleException
exception message : Object was open.

main thread ($1050):
0059cb4f RecorderApp.exe ADODB                TCustomADODataSet.OpenCursor
0053a72d RecorderApp.exe DB                   TDataSet.SetActive
0053a578 RecorderApp.exe DB                   TDataSet.Open
009137cd RecorderApp.exe WizardData   429 +10 TdmWizard.PrepareOutput
0092ab23 RecorderApp.exe FilterResult 664 +21 TfrmFilterResult.UpdateResults
0092a6da RecorderApp.exe FilterResult 572 +16 TfrmFilterResult.RunWizard
0092a627 RecorderApp.exe FilterResult 550  +1 TfrmFilterResult.WMRunWizard
004dd148 RecorderApp.exe Controls             TControl.WndProc
004e01a7 RecorderApp.exe Controls             TWinControl.WndProc
004f7c75 RecorderApp.exe Forms                TCustomForm.WndProc
004dfe24 RecorderApp.exe Controls             TWinControl.MainWndProc
00430c3c RecorderApp.exe Classes              StdWndProc
75817bc5 USER32.dll                           DispatchMessageA
004fe313 RecorderApp.exe Forms                TApplication.ProcessMessage
004fe34a RecorderApp.exe Forms                TApplication.HandleMessage
004fe57a RecorderApp.exe Forms                TApplication.Run
00aaad2e RecorderApp.exe RecorderApp  416 +79 initialization
75b5343b KERNEL32.dll                         BaseThreadInitThunk

thread $1550:
77c40186 ntdll.dll     NtWaitForMultipleObjects
75b5343b KERNEL32.dll  BaseThreadInitThunk

thread $d6c:
77c40186 ntdll.dll                 NtWaitForMultipleObjects
7613176f KERNELBASE.dll            WaitForMultipleObjectsEx
75b519f7 KERNEL32.dll              WaitForMultipleObjectsEx
7582088c USER32.dll                MsgWaitForMultipleObjectsEx
75820b8c USER32.dll                MsgWaitForMultipleObjects
00476bed RecorderApp.exe madExcept CallThreadProcSafe
00476c57 RecorderApp.exe madExcept ThreadExceptFrame
75b5343b KERNEL32.dll              BaseThreadInitThunk
>> created by main thread ($1050) at:
75b524ef KERNEL32.dll              CreateThread

thread $1234:
77c40186 ntdll.dll                 NtWaitForMultipleObjects
00476bed RecorderApp.exe madExcept CallThreadProcSafe
00476c57 RecorderApp.exe madExcept ThreadExceptFrame
75b5343b KERNEL32.dll              BaseThreadInitThunk
>> created by main thread ($1050) at:
75b524ef KERNEL32.dll              CreateThread

thread $23d4:
77c3f8fa ntdll.dll                 NtWaitForSingleObject
76131623 KERNELBASE.dll            WaitForSingleObjectEx
75b5118f KERNEL32.dll              WaitForSingleObjectEx
75b51143 KERNEL32.dll              WaitForSingleObject
00476bed RecorderApp.exe madExcept CallThreadProcSafe
00476c57 RecorderApp.exe madExcept ThreadExceptFrame
75b5343b KERNEL32.dll              BaseThreadInitThunk
>> created by main thread ($1050) at:
75b524ef KERNEL32.dll              CreateThread

thread $1ef4:
77c41f6f ntdll.dll     NtWaitForWorkViaWorkerFactory
75b5343b KERNEL32.dll  BaseThreadInitThunk