error starting with -d arg twice

when I start heidisql with -d=xxx parameter twice, second exec crashes (bugreport attached below).
other combinations (with -d then without -d, without -d then with -d, 2x without -d) work.

date/time : 2012-01-12, 18:47:41, 921ms
computer name : BOCHUM
user name : Falch <admin>
registered owner : Falch
operating system : Windows XP Service Pack 3 build 2600
system language : German
system up time : 7 hours 35 minutes
program up time : 2 seconds
processors : 2x AMD Athlon(tm) 64 X2 Dual Core Processor 6000+
physical memory : 1964/3071 MB (free/total)
free disk space : (C:) 3,97 GB
display mode : 1280x1024, 32 bit
process id : $17d8
allocated memory : 16,46 MB
command line : "C:\Programme\System\MySQL\Heidi\heidisql.exe" -d=.hier
executable : heidisql.exe
exec. date/time : 2012-01-10 21:24
version : 6.0.0.4024
compiled with : Delphi XE
madExcept version : 3.0m beta 1
callstack crc : $7bc3a08e, $ef24c693, $ef24c693
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 00407594 in module 'heidisql.exe'. Read of address 0000001B.

main thread ($534):
00407594 heidisql.exe System 548 +0 @UStrAddRef
00679dac heidisql.exe helpers 403 +0 sstr
007e0459 heidisql.exe Main 6901 +93 TMainForm.DBtreeFocusChanged
007e0a76 heidisql.exe Main 6997 +3 TMainForm.ConnectionReady
00711361 heidisql.exe dbconnection 1172 +5 TDBConnection.DoAfterConnect
0070f690 heidisql.exe dbconnection 974 +139 TMySQLConnection.SetActive
007d1a21 heidisql.exe Main 2918 +8 TMainForm.InitConnection
007e91a6 heidisql.exe Main 9588 +11 TMainForm.WMCopyData
004e8cbc heidisql.exe Controls TControl.WndProc
004ed580 heidisql.exe Controls TWinControl.WndProc
0056cb9c heidisql.exe Forms TCustomForm.WndProc
004ecc20 heidisql.exe Controls TWinControl.MainWndProc
004ab4d8 heidisql.exe Classes StdWndProc
7c91e470 ntdll.dll KiUserCallbackDispatcher
7e3693fd USER32.dll PeekMessageW
00575a8c heidisql.exe Forms TApplication.ProcessMessage
00575bae heidisql.exe Forms TApplication.HandleMessage
00575ed9 heidisql.exe Forms TApplication.Run
007fa8fb heidisql.exe heidisql 67 +16 initialization