About COMDLG32, the problem is locking all functionalities for open/close file dialogs. If I launch, for example, notepad and I select File->Open, nothing happens.
I have no such problem.
Just tested latest trunk (compiled myself and compiled by our BuildBot) and both builds do not show this problem. You can try it for yourself by downloading an ISO from http://reactos.colinfinck.de/gebuilds
Did you try a clean build after updating to latest trunk?
Best regards,
Colin