Fixed the lockups in H3Viewer. This only happened on a few machines so was hard to track down.
Please try the new 1.2 build 66. I found that on our 64bit Win 7 PC calls to ShlObj.SHAddToRecentDocs() would sometimes (randomly) not return for long periods for URLs like http://127.0.0.1/... Converting these URLs to ms-xhelp://... format seems to fix this and H3Viewer is now very responsive on our test machines. If this is still a problem for others we'll remove this call completely.
Another improvement is that you can now tab and focus the browser control using just the keyboard.
Check the menu for new keyboard commands.