MyDefrag Crash

Hi,
I just got the following crash report:

01:17:24 I have crashed in function 'DefragThread' in source '.\MyDefrag.cpp' on line 52.
Exception: ACCESS_VIOLATION (the memory could not be read or written)
Command line: "C:\Program Files\MyDefrag v4.3.1\MyDefrag.exe"
Context is not locked.
1. At line 142 in 'd:\www.mydefrag.com\sources\lib\programhints.cpp'
2. At line 311 in 'd:\www.mydefrag.com\sources\lib\programhints.cpp'
3. At line 2485 in 'd:\www.mydefrag.com\sources\lib\interpret.cpp'
4. At line 44 in 'd:\www.mydefrag.com\sources\lib\interpret.cpp'
5. At line 1267 in 'd:\www.mydefrag.com\sources\lib\interpret.cpp'
6. At line 44 in 'd:\www.mydefrag.com\sources\lib\interpret.cpp'
7. At line 4766 in 'd:\www.mydefrag.com\sources\lib\interpret.cpp'
Trying to crash the other threads for debugging purposes....
01:17:32 I have crashed in function 'wWinMain' in source '.\MyDefrag.cpp' on line 133.
Exception: ACCESS_VIOLATION (the memory could not be read or written)
Command line: "C:\Program Files\MyDefrag v4.3.1\MyDefrag.exe"
Current context locks:
ShowItemInfo
1. At line 416 in 'd:\www.mydefrag.com\sources\lib\items.cpp'
2. At line 900 in 'd:\www.mydefrag.com\sources\lib\graphics.cpp'
3. At line 893 in 'd:\www.mydefrag.com\sources\lib\callback.cpp'
4. At line 70 in 'd:\www.mydefrag.com\sources\mydefrag\mydefrag.cpp'
7. At line 117 in 'd:\www.mydefrag.com\sources\mydefrag\mydefrag.cpp'
8. At line 263 in 'f:\dd\vctools\crt_bld\self_64_amd64\crt\src\crt0.c'
Trying to crash the other threads for debugging purposes....

FYI - I have MyDefragGUI installed and am using MyDefrag on a Win 7 Professional, 64-bit Laptop with all the latest service packs applied.

Thanks,
Frank