I'm running build 1423.01 on WinXP Pro SP1
After about ten minutes of work, my taskinfo2003 warned me of a GDI object overflow.
coreftp had over 4500 (!) GDI objects allocated.
Playing around a bit, I found:
* In this session I did a lot of file deletes. Looks like one or more GDI objects leak per file deleted
* Using Site Manager to load a new session seems to cause some leaks.
I'm not sure what else did it, but clearly you need to scan the code for GDI leakage.