The IMCE on my site behaves strange. I think it is a IMCE problem, although it is used from TinyMCE.
1. When resizing the IMCE dialog window, the area where files are displayed shrinks automatically.
2. It is sometimes not possible to drag the dotted bar delimiting the file area
Those behaviours are presented here: http://img6.imageshack.us/img6/9779/t9m.mp4
I would expect that the file area remains proportional to the size of the IMCE window while resizing it.