I just noticed that FlexTime and Default Folder X (version 3.0.1, the latest for PPC based macs) might have an incompatibility. When I double-click on a routine file and FlexTime is not yet running, it opens as it should. However, if FlexTime is already running, it just does nothing. I explicitely disable FlexTime in the preferences for Default Folder, then the erratic behaviour disappears. Anybody else had this problem?
(Other than that, looks like a nice application.)