Is there a particular reason you've chosen to use the place geometry manager? It might seem that absolute placement is a Good Thing, however it ends up causing more problems than it solves. This includes dealing well with different fonts, resolutions, etc.

I've found that there's very little I can't accomplish by sticking with either pack or grid, or layouts that use a combination of both (group of gridded widgets within a frame that is packed with other widgets, for example).